Sanitary Fixtures, Fittings and Appliance Installation
Scope
This domain tests installation of water closets, wash basins, sinks, urinals, bidets, bathtubs, showers, geysers and washing machines, including brackets, seals, trap connections and water supply fittings. Installation must be level, accessible for maintenance and matched to the fixture's inlet and outlet sizes.
Core rules
- Fix brackets into sound masonry with approved fasteners; do not rely on tile alone.
- Keep an accessible isolating valve on each fixture supply; use flexible connectors only where approved and protected from kinking.
- A wash basin rim is commonly set about 750–800 mm above finished floor; a WC pan must sit level with a new wax or rubber seal and be bolted without rocking.
- Every fixture that discharges to drainage needs a trap with a water seal; the trap must be accessible for cleaning.
- Connect the fixture waste with the correct diameter and fall; do not reduce the outlet.
- For a geyser, fit a pressure-relief valve and expansion provision on a closed system; connect cold inlet and hot outlet correctly.
- For a washing machine, use a dedicated tap and a standpipe or trapped waste with an air break.
Worked example
Install a wall-hung wash basin. Mark the rim height at 780 mm, check the bracket holes are level, drill and plug, and fix the bracket. Fit the trap and waste before hanging the basin. Connect the 15 mm supply through a mini stop valve, then check the basin is level, the trap seal is intact and the waste falls to the stack. Test for leaks at the supply and waste.
Traps
Do not seal a WC to an unlevel floor; do not omit the trap; do not connect a geyser relief valve to a closed pipe; do not over-tighten plastic nuts; do not leave a flexible connector under tension.