MA Plumber key terms

A document issued by the local plumbing inspector that authorizes specific plumbing work at a stated address; work may not begin until the permit is issued and posted as required.

A written approval issued by the plumbing inspector after work passes required inspections, confirming the installation complies with the Massachusetts plumbing code and allowing the system to be placed in service.

The state board that licenses plumbers and gas fitters in Massachusetts, adopts and amends the uniform plumbing and gas codes, and hears disciplinary and appeals matters.

Written permission from the authority having jurisdiction to use an alternative method or material when strict compliance with the code is impractical, granted only when equivalent safety and performance are demonstrated.

A written notice from the inspector that halts all or part of a job because work is unsafe, unpermitted, or noncompliant; work may not resume until the issue is corrected and released.

A licensee authorized to design and install plumbing, obtain plumbing permits, and supervise journeymen and apprentices; the master is responsible for code compliance on permitted work.

An inspection performed after piping is installed but before it is concealed by walls, floors, or ceilings, verifying that drainage, waste, vent, and water piping are correctly sized, sloped, and supported.

The pipe carrying potable water from the public main or private source to the building, ending at the water meter or the first shutoff valve inside the structure.

A device that lowers incoming water pressure to a safe, usable level downstream, protecting fixtures and piping from excessive pressure and reducing noise and wear.

A device or assembly that stops reversed flow of water in a piping system, protecting the potable supply from contamination by used water or other unwanted substances.

An unobstructed physical separation between the lowest opening of a water-supply outlet and the flood-level rim of the receiving fixture; the most reliable form of backflow protection.

Any actual or potential link between the potable water system and a source of contamination or pollution that could allow unwanted material to enter the drinking water supply.

A pressurized chamber or device installed near a quick-closing valve that absorbs the shock wave created when water flow stops suddenly, preventing noise and pipe damage.

A unit of measure expressing the probable demand a fixture places on the water supply system, based on its flow rate and the duration and frequency of use.

A measure of the probable discharge rate and volume a fixture adds to the drainage system, used to size drains, stacks, and building sewers.

A vertical pipe that carries the discharge of water closets and may also receive other fixture waste; it extends through the roof or connects to a vent terminal.

A vertical vent pipe that provides air to the drainage system to protect trap seals, typically serving the upper portion of a soil or waste stack.

The pipe section between a fixture trap outlet and its connection to a vented drain, limited in length so the trap seal is not siphoned.

The depth of water held in a fixture trap that blocks sewer gas from entering the building; it must be maintained within code limits and replenished where evaporation occurs.

The lowest piping of a drainage system that receives waste from fixtures inside the building and conveys it to the building sewer, usually at or below the lowest floor.

An accessible fitting with a removable plug installed on drainage piping so the line can be rodded or cleared of blockages without dismantling the system.

A one-way valve that opens to admit air into drainage piping when flow creates negative pressure and closes to prevent sewer gas from escaping; used only where the code permits.

A receptacle installed in the waste line from kitchen fixtures that slows flow so fats, oils, and grease float and are retained, keeping them out of the drainage system.

A one-way check device installed in a drainage line to prevent sewage from reversing into the building when the public sewer surcharges or backs up.

A safety device on a water heater that opens and discharges water when temperature or pressure inside the tank exceeds safe limits, preventing rupture or explosion.

A drainage connection in which fixture waste discharges through an air gap or air break into a receptor rather than being piped directly into the drainage system.

All piping, fittings, valves, regulators, and connectors that convey fuel gas from the point of delivery to the appliance connections, installed and tested under the gas code.

Corrugated stainless steel tubing, a flexible gas piping material that must be installed with listed fittings, protected from physical damage, and bonded per code requirements.

A short, capped drip leg installed at the appliance connection that collects dirt, pipe scale, and moisture so they do not reach the gas controls or burner.

A required procedure in which the completed gas piping is sealed, filled with air or inert gas, and monitored with a gauge to prove it holds pressure without leaking.

A device that reduces and maintains gas pressure at a steady level suitable for downstream piping and appliances, typically adjustable within a listed range.

A device on a natural-draft appliance that provides dilution air and stabilizes draft, allowing flue gases to vent safely while preventing backdraft from disturbing combustion.

A listed double-wall metal vent with a fixed air space used to vent listed gas appliances that produce flue gas temperatures within its rating.

The air an appliance needs to burn fuel safely; the code requires a sufficient, unobstructed supply from outdoors or from an adequately sized indoor volume.

A condition in which flue gases spill into the building instead of rising up the vent, usually caused by depressurization, a blocked flue, or inadequate draft.

Gloves, eye protection, hard hat, respirator, and other gear worn to reduce injury from job-site hazards; employers must provide it and train workers in its use.

A procedure for de-energizing equipment and applying locks and tags so it cannot be started while a worker services or repairs it.

The practices for protecting workers in trenches, including sloping, shoring, or shielding, keeping spoil back from the edge, and providing safe access and egress.

A statutory claim a contractor or supplier can file against improved property to secure payment for labor or materials, subject to strict deadlines and notice requirements.

Insurance required of employers that pays medical costs and lost wages to employees injured on the job, regardless of fault, in exchange for limits on lawsuits.