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TX Plumber practice questions

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Question 1Responsible Master Plumber

Under Texas law, which individual is legally responsible for ensuring that plumbing work performed under a plumbing license is done in compliance with the plumbing code?

  1. The journeyman plumber who physically performed the installation
  2. The master plumber who holds the responsible master plumber designation for the company Correct answer.
  3. The plumbing inspector who approved the rough-in
  4. The property owner who contracted for the work

Explanation

A responsible master plumber is the license holder who assumes legal responsibility for the plumbing work performed by a plumbing company. Journeymen and other licensees work under that authority, and inspectors and owners do not carry the licensee's code responsibility.

Question 2Responsible Master Plumber

A plumbing company wants to operate as a plumbing contracting business in Texas. Which license must the company hold?

  1. A master plumber license held by every technician
  2. A plumbing inspector license held by a supervisor
  3. A plumbing contractor license issued to the business entity Correct answer.
  4. A journeyman license held by at least one employee

Explanation

Plumbing contracting businesses must hold a plumbing contractor license, which is tied to a designated responsible master plumber. Individual journeyman or master licenses belong to persons, not to the business entity.

Question 3Responsible Master Plumber

A responsible master plumber leaves a plumbing company and the company continues to advertise and perform plumbing work. What is the status of the company's plumbing contractor license?

  1. It becomes invalid because the company no longer has a designated responsible master plumber Correct answer.
  2. It converts automatically to a journeyman-level authorization
  3. It remains valid if any licensed plumber is on staff
  4. It remains valid until the next scheduled renewal date

Explanation

A plumbing contractor license depends on a designated responsible master plumber. When that designation lapses, the contractor license is no longer valid until a new responsible master plumber is designated.

Question 4Responsible Master Plumber

Which task is a responsible master plumber generally expected to perform for the plumbing work a company performs?

  1. Serving as the municipal plumbing inspector for the jurisdiction
  2. Providing general supervision and ensuring code-compliant work by licensees Correct answer.
  3. Guaranteeing that no plumbing system will ever require repair
  4. Personally performing every installation on every job

Explanation

The responsible master plumber provides general supervision over plumbing work and is accountable for code compliance. The role does not require personally performing every task or acting as the regulator.

Question 5Responsible Master Plumber

A responsible master plumber is supervising a crew installing a new water heater. Which action best demonstrates fulfillment of the supervisory duty?

  1. Delegating all code decisions to the supply house counter staff
  2. Reviewing the installation requirements with the crew and verifying the completed work Correct answer.
  3. Leaving the crew to follow manufacturer instructions without any review
  4. Relying on the homeowner to confirm the work looks correct

Explanation

Supervision means the responsible master plumber ensures the crew knows and follows applicable requirements and that completed work is verified. Delegating code decisions to suppliers or owners does not satisfy the duty.

Question 6Responsible Master Plumber

Which statement correctly describes the relationship between a responsible master plumber and journeyman plumbers working for the same company?

  1. Journeymen perform plumbing work under the general supervision of the responsible master plumber Correct answer.
  2. Journeymen hold independent authority to designate the company's responsible master plumber
  3. Journeymen may contract directly with the public for plumbing work
  4. Journeymen are exempt from continuing education requirements

Explanation

Journeymen work under the general supervision of the responsible master plumber and cannot independently contract with the public for plumbing work. The responsible master plumber holds the contracting authority for the company.

Question 7Responsible Master Plumber

A customer asks a plumbing company to perform work that the responsible master plumber believes would violate the plumbing code. What is the appropriate response?

  1. Ask the journeyman to decide whether to proceed
  2. Decline to perform the noncompliant work and explain the code requirement to the customer Correct answer.
  3. Perform the work exactly as requested to satisfy the customer
  4. Perform the work and note the code issue only on the invoice

Explanation

The responsible master plumber is accountable for code compliance and should not authorize work that violates the code. The correct approach is to decline the noncompliant work and inform the customer of the requirement.

Question 8Responsible Master Plumber

Which record-keeping practice best supports a responsible master plumber's accountability for plumbing work?

  1. Maintaining records of permits, inspections, and work performed by the company Correct answer.
  2. Recording only the dates employees were paid
  3. Retaining records solely when a customer requests them
  4. Keeping only receipts for materials purchased

Explanation

Permit, inspection, and work records document that plumbing work was authorized and inspected, supporting the responsible master plumber's accountability. Material receipts or payroll records alone do not establish code compliance.

Question 9Responsible Master Plumber

A responsible master plumber discovers that an unlicensed worker on a job site has been making plumbing connections. What is the appropriate action?

  1. Reassign the worker to plumbing tasks that are less visible
  2. Stop the unlicensed plumbing work and ensure plumbing tasks are performed by licensed personnel Correct answer.
  3. Allow the work to continue if the connections later pass inspection
  4. Report the situation only if the customer complains

Explanation

Plumbing work must be performed by properly licensed individuals, and the responsible master plumber must ensure that requirement is met. Passing inspection later does not cure unlicensed work.

Question 10Responsible Master Plumber

Which of the following is the primary purpose of requiring a responsible master plumber for a plumbing contracting business?

  1. To reduce the number of plumbing businesses operating in a city
  2. To allow unlicensed workers to perform plumbing under supervision
  3. To establish a licensed individual accountable for the company's plumbing work Correct answer.
  4. To guarantee that plumbing work is performed at the lowest possible cost

Explanation

The responsible master plumber requirement creates a named, licensed individual who is accountable for the company's plumbing work. It is a public-protection measure, not a cost-control or competition-limiting tool.

Question 11Responsible Master Plumber

A responsible master plumber is planning a commercial project and must determine which code edition applies. What is the most reliable source of that information?

  1. The edition used on a similar project in another state
  2. The preference of the general contractor's superintendent
  3. The plumbing code adopted by the authority having jurisdiction for that project Correct answer.
  4. A manufacturer's installation brochure from a prior year

Explanation

The applicable code is the edition adopted and enforced by the authority having jurisdiction where the work occurs. Other states' editions, old brochures, or on-site preferences do not establish the legal code requirement.

Question 12Responsible Master Plumber

A responsible master plumber wants to verify that a newly hired plumber is properly licensed. Which approach is most appropriate?

  1. Rely on the applicant's statement that the license is current
  2. Accept a photocopy of a license the applicant provides
  3. Check the individual's license status with the state licensing authority Correct answer.
  4. Assume licensure based on years of field experience

Explanation

Verifying license status directly with the state licensing authority confirms current, valid licensure. A copy, a verbal statement, or experience alone does not confirm active licensure.

Question 13Responsible Master Plumber

Which situation most clearly requires the responsible master plumber to obtain a permit before work begins?

  1. Replacing a water service line to a residence Correct answer.
  2. Unclogging a kitchen sink drain
  3. Replacing a faucet aerator
  4. Tightening a loose toilet tank bolt

Explanation

Replacing a water service line is regulated plumbing work that generally requires a permit and inspection. Minor maintenance such as clearing a drain, replacing an aerator, or tightening a tank bolt ordinarily does not.

Question 14Responsible Master Plumber

A plumbing inspector finds a code violation on a job the company performed. Which response best reflects the responsible master plumber's obligations?

  1. Complete the correction only if the customer agrees to pay again
  2. Dispute the finding without making any corrections
  3. Correct the violation and arrange for reinspection Correct answer.
  4. Wait until the next project to apply the corrected practice

Explanation

The responsible master plumber is accountable for bringing noncompliant work into compliance and having it reinspected. Disputing without correction or deferring the fix leaves the violation unresolved.

Question 15Responsible Master Plumber

Which practice best demonstrates that a responsible master plumber is maintaining the required continuing education?

  1. Relying on a coworker to report the hours
  2. Attending any trade show and counting the hours
  3. Reading plumbing magazines and self-certifying the hours
  4. Completing approved courses and retaining completion documentation Correct answer.

Explanation

Continuing education must be completed through approved courses, and documentation should be retained to demonstrate compliance. Unapproved activities or self-certified reading do not satisfy the requirement.

Question 16Responsible Master Plumber

A responsible master plumber is asked to sign a permit application for work that another unlicensed individual will perform. What is the appropriate action?

  1. Sign only if the other individual promises to follow the code
  2. Refuse to sign because the licensee would be accountable for work not under proper authority Correct answer.
  3. Sign the application so the work can proceed quickly
  4. Sign and note on the application that another party will do the work

Explanation

Signing a permit application makes the licensee accountable for the permitted work, so it should not be used to cover work performed outside proper licensed authority. A promise to follow the code does not cure the licensing problem.

Question 17Responsible Master Plumber

Which action by a responsible master plumber best protects public health on a project involving a backflow prevention assembly?

  1. Installing the assembly without testing because it is new
  2. Relying on the manufacturer's claim that the device works
  3. Ensuring the assembly is tested by a qualified tester and results are documented Correct answer.
  4. Testing the assembly only if the water pressure seems low

Explanation

Backflow prevention assemblies must be tested to confirm they function, and test results are documented for the authority having jurisdiction. New equipment and manufacturer claims do not substitute for required testing.

Question 18Responsible Master Plumber

A responsible master plumber is evaluating whether a proposed gas piping installation complies with the code. Which consideration is most directly within the responsible master plumber's scope?

  1. Whether the general contractor has scheduled other trades
  2. Whether the piping materials, sizing, and testing meet the adopted fuel gas code Correct answer.
  3. Whether the supplier offers a volume discount
  4. Whether the customer prefers a particular pipe color

Explanation

Fuel gas piping must comply with the adopted fuel gas code, including material, sizing, and testing requirements. Aesthetic preferences, scheduling, and pricing are not code compliance issues.

Question 19Responsible Master Plumber

Which statement best describes the responsible master plumber's duty when a customer requests work that is outside the company's licensed scope?

  1. Perform the work anyway to keep the customer's business
  2. Explain the limitation and refer the customer to an appropriately licensed provider Correct answer.
  3. Perform the work and disclaim responsibility in the contract
  4. Have an unlicensed employee perform the work instead

Explanation

Work outside the company's licensed scope should not be undertaken; the proper response is to explain the limitation and refer the customer appropriately. Contract disclaimers or reassigning to unlicensed workers do not cure the scope problem.

Question 20Responsible Master Plumber

Which of the following best describes the responsible master plumber's role in a company's safety program?

  1. Promoting safe work practices and ensuring crews are trained on job hazards Correct answer.
  2. Delegating all safety decisions to the newest employee
  3. Addressing safety only after an accident occurs
  4. Treating safety training as optional for experienced crews

Explanation

The responsible master plumber should promote safe practices and ensure crews receive hazard training. Safety is a proactive supervisory responsibility, not a reactive or optional one.

Question 21Responsible Master Plumber

A responsible master plumber is reviewing a contract for a plumbing installation. Which contract term most directly supports the licensee's accountability?

  1. A provision allowing unlicensed subcontractors
  2. A clause disclaiming all responsibility for code compliance
  3. A statement that the customer supervises all work
  4. A clear description of the scope of work and applicable code requirements Correct answer.

Explanation

A clear scope description tied to applicable code requirements documents what compliant work means for the project. Disclaiming code responsibility, shifting supervision to the customer, or allowing unlicensed subcontractors undermines accountability.

Question 22Responsible Master Plumber

Which document would best help a responsible master plumber demonstrate that a completed installation was inspected and approved?

  1. The employee timecard for the install day
  2. The material delivery receipt
  3. The inspection record showing final approval Correct answer.
  4. The customer's handwritten thank-you note

Explanation

An inspection record showing final approval is direct evidence that the work was reviewed and approved by the authority having jurisdiction. Delivery receipts, timecards, and notes do not document inspection approval.

Question 23Responsible Master Plumber

A responsible master plumber learns that a crew member has been bypassing required pressure testing to save time. What is the most appropriate corrective action?

  1. Ignore the practice because testing takes time
  2. Allow the practice if no leaks have been reported
  3. Document the practice as an accepted shortcut
  4. Require the required testing to be performed and retrain the crew on the testing procedure Correct answer.

Explanation

Required pressure testing verifies the integrity of the installation and must be performed. The responsible master plumber should enforce the requirement and retrain the crew rather than accept shortcuts.

Question 24Responsible Master Plumber

Which of the following best reflects the responsible master plumber's duty regarding manufacturer instructions for plumbing equipment?

  1. Following instructions only when the customer requests it
  2. Following the manufacturer's installation instructions as required by the code Correct answer.
  3. Substituting personal preferences for the instructions
  4. Disregarding instructions when they seem inconvenient

Explanation

Plumbing codes generally require equipment to be installed in accordance with the manufacturer's instructions. Convenience, customer request, or personal preference does not override that requirement.

Question 25Responsible Master Plumber

A responsible master plumber is deciding how to handle a dispute with a customer about the quality of a completed installation. Which approach best reflects professional responsibility?

  1. Offer a discount in exchange for a waiver of all code claims
  2. Refuse to communicate with the customer until paid in full
  3. Review the work against the code and contract, document findings, and resolve the issue Correct answer.
  4. Blame the crew publicly without reviewing the work

Explanation

Professional handling of a dispute involves reviewing the work against the code and contract, documenting findings, and working to resolve the issue. Refusing communication, public blame, or code-claim waivers do not meet that standard.

Question 26Responsible Master Plumber

Under Texas law, a plumbing contractor's license is held by which party?

  1. The journeyman plumber with the most seniority
  2. The largest shareholder of the plumbing company
  3. The responsible master plumber who qualifies the business Correct answer.
  4. The licensed plumbing inspector assigned to the area

Explanation

In Texas the plumbing contractor license is issued to and qualified by a responsible master plumber, and the business operates under that individual's license. The license does not attach to shareholders, senior journeymen, or inspectors.

Question 27Responsible Master Plumber

A responsible master plumber wants to add plumbing work in a new category to the company's offerings. What must the responsible master plumber verify first?

  1. That the license covers the scope of work and any required endorsements are in place Correct answer.
  2. That the company has purchased additional vehicles for the crew
  3. That a journeyman has agreed to supervise the new work
  4. That the customer has signed a maintenance agreement

Explanation

A responsible master plumber may only contract for work within the scope authorized by the license and any applicable endorsements. Expanding into a new category requires confirming that authority before bidding or performing the work.

Question 28Responsible Master Plumber

Which item must a responsible master plumber typically maintain and make available to show that the business is properly licensed?

  1. A list of every supplier the company has used in the past year
  2. A log of employee lunch breaks
  3. A marketing plan for the coming year
  4. A copy of the current license and the records tying the business to the qualifying master Correct answer.

Explanation

Demonstrating proper licensure depends on keeping the current license and records that connect the business entity to the qualifying responsible master plumber. These are the documents an inspector or regulator would request.

Question 29Responsible Master Plumber

A responsible master plumber is bidding a job and the plans call for a type of piping the crew has never installed. What is the most appropriate action?

  1. Submit the bid and substitute a familiar material without notifying anyone
  2. Decline to bid until the responsible master plumber has confirmed the code requirements and the crew's competence for that method Correct answer.
  3. Bid the job and subcontract the entire project to an unlicensed helper
  4. Submit the bid and rely on the crew to learn the method during installation

Explanation

The responsible master plumber is accountable for the technical adequacy of the work, so unfamiliar methods must be researched for code compliance and matched to qualified installers before committing. Bidding first and learning on the job shifts risk onto the customer and the public.

Question 30Responsible Master Plumber

What is the responsible master plumber's obligation when a licensed journeyman on the crew repeatedly fails to follow the adopted plumbing code?

  1. Take corrective action, including retraining or reassignment, to ensure code-compliant work Correct answer.
  2. Report the journeyman to the customer and take no further action
  3. Ignore the issue because the journeyman holds a separate license
  4. Transfer the journeyman to another company without documentation

Explanation

The responsible master plumber supervises the plumbing work performed under the license and must ensure it complies with the adopted code. Repeated noncompliance requires documented corrective action such as retraining, closer supervision, or reassignment.

Question 31Responsible Master Plumber

A responsible master plumber is asked to qualify a license for a business in which the master plumber has no role in daily operations. What is the best response?

  1. Decline only if the business is located in another county
  2. Agree, because the license only requires a name on the application
  3. Agree, provided the master plumber visits the office once a year
  4. Decline, because qualifying a license requires actual responsibility for the plumbing work Correct answer.

Explanation

Qualifying a license carries genuine responsibility for the plumbing work performed under it, so a master plumber cannot lend a name to an operation the master does not actually oversee. Doing so undermines the accountability the licensing system is built on.

Question 32Responsible Master Plumber

Which action best fulfills the responsible master plumber's duty to keep the licensing board informed of changes to the business?

  1. Waiting for the board to discover changes during a routine inspection
  2. Announcing changes only on the company website
  3. Notifying the board of changes such as the business name, address, or qualifying master Correct answer.
  4. Informing only the suppliers who deliver materials

Explanation

Licensees are expected to report material changes to the business or the qualifying master so the licensing records stay accurate. Relying on the board to discover changes or on informal notice does not meet that duty.

Question 33Responsible Master Plumber

A responsible master plumber is reviewing a subcontractor's insurance and licensing before allowing the subcontractor to perform plumbing work on a project. Which finding should stop the work from proceeding?

  1. The subcontractor's crew arrives earlier than scheduled
  2. The subcontractor's license is current but the insurance certificate has lapsed Correct answer.
  3. The subcontractor prefers a different brand of pipe dope
  4. The subcontractor uses a newer model of pipe wrench

Explanation

Allowing an uninsured subcontractor to perform work exposes the project and the responsible master plumber to liability the license is meant to control. A lapsed certificate must be resolved before the subcontractor begins work.

Question 34Responsible Master Plumber

A responsible master plumber is preparing to close out a project. Which combination best demonstrates that the plumbing work was completed and approved as required?

  1. Inspection approvals and required test records retained with the project file Correct answer.
  2. A verbal assurance from the crew that everything passed
  3. Photographs of the crew on site
  4. Signed contracts and a paid invoice

Explanation

Closeout documentation should include the inspection approvals and required test records, which show the work was verified against the code. Contracts, invoices, verbal assurances, and site photos do not establish code compliance.

Question 35Master Plumber

Under the Texas Plumbing License Law, which state agency administers plumbing licensing and enforcement?

  1. Texas State Board of Plumbing Examiners Correct answer.
  2. Texas Department of Licensing and Regulation
  3. Texas Commission on Environmental Quality
  4. Texas Department of Insurance

Explanation

The Texas State Board of Plumbing Examiners is the agency created by statute to license plumbers and enforce the Plumbing License Law. TCEQ handles environmental programs and TDLR handles many other occupational licenses, but not plumbing.

Question 36Master Plumber

A master plumber who holds a Texas master plumber license and wants to perform plumbing work in a municipality that requires a local registration must generally do what?

  1. Obtain a separate state apprentice card
  2. Surrender the state license while working locally
  3. Pass the state journeyman examination again
  4. Register with that municipality as required by local ordinance Correct answer.

Explanation

State licensure is the baseline, but some municipalities impose their own registration or permit requirements. A licensed master plumber complies with local registration rather than abandoning the state license.

Question 37Master Plumber

In Texas, a master plumber's responsibility for a plumbing installation generally extends to which of the following?

  1. Only the fixtures the master personally installs
  2. All work performed under the master's supervision and permits Correct answer.
  3. Only work inspected by the state
  4. Only commercial projects above a set dollar value

Explanation

A master plumber is responsible for plumbing work performed under the master's authority, including supervision of licensed and unlicensed helpers and compliance with permits. Responsibility is not limited to work the master personally performs.

Question 38Master Plumber

Which document typically authorizes a plumbing contractor to begin a specific installation and triggers the inspection process?

  1. A material safety data sheet
  2. A plumbing permit Correct answer.
  3. A lien waiver
  4. A certificate of occupancy

Explanation

A plumbing permit is issued by the authority having jurisdiction and authorizes the work described, with inspections scheduled as phases are completed. A certificate of occupancy is issued after work is approved, not before.

Question 39Master Plumber

A master plumber is designing a water service for a building and must size the meter and service line. Which factor most directly governs the minimum size of the water service?

  1. The number of hose bibs on the exterior
  2. The building's total fixture-unit demand and pressure requirements Correct answer.
  3. The color of the piping
  4. The age of the building

Explanation

Water service sizing is based on the total demand expressed in fixture units, adjusted for pressure, elevation, and developed length. Pipe color and building age do not determine hydraulic capacity.

Question 40Master Plumber

What is the primary purpose of an air gap in a plumbing system?

  1. To provide backflow protection by physical separation Correct answer.
  2. To increase water pressure at fixtures
  3. To filter sediment from the supply
  4. To reduce noise in drain lines

Explanation

An air gap provides the highest level of backflow protection because it creates a physical separation between the potable supply and any potential contaminant. It does not boost pressure, muffle noise, or filter water.

Question 41Master Plumber

A reduced pressure zone backflow assembly is installed on a commercial water service. Which maintenance practice is required to keep it functioning as designed?

  1. Painting the assembly annually
  2. Replacing the assembly every two years
  3. Removing the relief valve to prevent discharge
  4. Annual testing by a certified tester Correct answer.

Explanation

Reduced pressure zone assemblies must be tested at least annually by a certified backflow tester to verify the differential relief valve and check valves operate correctly. Disabling the relief valve defeats the protection.

Question 42Master Plumber

What is the minimum size of a building drain serving a single-family dwelling under typical Texas plumbing code provisions?

  1. 3 inches
  2. 2 inches Correct answer.
  3. 4 inches
  4. 1-1/2 inches

Explanation

The building drain of a dwelling is commonly required to be not less than 2 inches in diameter, though larger sizes are needed for greater fixture-unit loads. A 1-1/2 inch drain is too small for a building drain.

Question 43Master Plumber

A horizontal drain pipe must maintain slope to carry solids. What is the standard fall for a 3-inch horizontal drain?

  1. 1/2 inch per foot
  2. 1/8 inch per foot Correct answer.
  3. 1/16 inch per foot
  4. 1/4 inch per foot

Explanation

Pipes 3 inches and larger are typically sloped at 1/8 inch per foot, while smaller pipes use 1/4 inch per foot. Excessive slope can cause liquid to outrun solids.

Question 44Master Plumber

Why is a vent required on a plumbing fixture drain?

  1. To provide a cleanout access point
  2. To equalize pressure and protect the trap seal Correct answer.
  3. To allow grease to escape
  4. To increase the velocity of the waste

Explanation

Venting admits air behind the flow to equalize pressure in the drainage system, preventing siphonage of trap seals. Vents do not increase waste velocity or serve as cleanouts.

Question 45Master Plumber

A fixture's trap seal must be maintained at a proper depth. What is the typical trap seal depth range required for plumbing fixtures?

  1. 10 to 12 inches
  2. 1/2 to 1 inch
  3. 2 to 4 inches Correct answer.
  4. 6 to 8 inches

Explanation

Fixture traps are designed with a seal depth of at least 2 inches and not more than 4 inches. A deeper seal is more easily siphoned or subject to foul odors.

Question 46Master Plumber

A water heater is installed in a garage where flammable vapors may be present. What protection is required?

  1. A pressure-reducing valve on the cold inlet
  2. Ignition protection such as a flammable vapor ignition resistant design or elevation Correct answer.
  3. A drip pan under the heater
  4. A recirculation pump

Explanation

Water heaters installed in garages must be protected against ignition of flammable vapors, typically by an FVIR design or by elevating the ignition source. A drip pan addresses leakage, not vapor ignition.

Question 47Master Plumber

What is the function of a temperature and pressure relief valve on a storage water heater?

  1. To prevent backflow into the cold supply
  2. To drain the tank during normal operation
  3. To relieve excess pressure or temperature before tank failure Correct answer.
  4. To mix hot and cold water at the outlet

Explanation

The temperature and pressure relief valve opens when internal pressure or temperature exceeds safe limits, preventing a tank rupture. It must discharge to a safe location and is not a mixing or backflow device.

Question 48Master Plumber

A master plumber is calculating the gas pipe size for a new commercial range. Which factor is essential in addition to the appliance's input rating?

  1. The color of the gas piping
  2. The number of electrical outlets in the kitchen
  3. The total connected load and the longest developed length Correct answer.
  4. The building's roof pitch

Explanation

Gas pipe sizing requires the total connected load in Btu per hour and the longest developed length of piping from the meter to the farthest appliance. Pipe color and unrelated building features do not affect gas capacity.

Question 49Master Plumber

Which material is generally approved for use as a gas piping material in a residential installation?

  1. PVC DWV pipe
  2. Cast iron soil pipe
  3. Copper tube used for drain lines
  4. Black steel pipe Correct answer.

Explanation

Black steel pipe is a standard approved material for natural gas and propane piping. Cast iron soil pipe and PVC DWV pipe are drainage materials and are not gas piping.

Question 50Master Plumber

A master plumber must ensure a gas appliance connector is installed correctly. Which practice is acceptable?

  1. Concealing the connector behind permanent drywall
  2. Running the connector through a wall
  3. Using a connector longer than allowed to reach the appliance
  4. Connecting the appliance rigidly with approved pipe where a connector is not needed Correct answer.

Explanation

Appliances may be connected with approved rigid piping, and when a flexible connector is used it must be exposed, within length limits, and not concealed or run through walls. Concealing or over-length connectors create hazards.