Riser
A supply line pipe that rises from one story to the next; also the short vertical pipes that bring water from the branch to the fixture. Back to alphabetical list

Rough-in
Installation of the drain, vent, and supply lines in the structure prior to installation of the fixtures. Back to alphabetical list

Shutoff Valve
Most commonly refers to the angle stops installed under sinks and toilets, but valves are also installed on branch lines and alongside the meter. Back to alphabetical list

Sillcock
Another name for hose bibb. Back to alphabetical list

Solder
A metal alloy that is melted to create a fused joint between metal pieces. Back to alphabetical list

Stack
The vertical main in the DWV system extending one or more stories. Back to alphabetical list

Stop
The shutoff valves under sinks and toilets. Back to alphabetical list

Stub-out
Short lengths of pipe installed during rough-in to which fixtures and drains will eventually be installed. Back to alphabetical list

Sweating
Slang for soldering. Back to alphabetical list

Sweep
The eased change of direction in a drain fitting that allows for smooth passage of waste. Fittings with abrupt changes of direction, such as a vent tee, may only be used for vents. Back to alphabetical list

T&P Valve
Temperature and pressure valve. A valve that opens to release excess pressure and temperature in a system. Back to alphabetical list

Tailpiece
The section of pipe that runs between a fixture outlet and the trap. Back to alphabetical list

Tee Fitting
Fittings that allow another pipe to be joined at a 90-degree angle. Those for the drain system have the changes of direction eased. See Sweep. Back to alphabetical list

Trap
A fitting or portion of a fixture that, when properly vented, holds water to prevent entry of sewer gases. Back to alphabetical list

Valve
A device that regulated the flow of water. Back to alphabetical list

Valve Seat
The immovable portion of a valve. Water flow is stopped when the movable portion of the valve comes in contact with the valve seat. Back to alphabetical list

Vent
A pipe that allows air into a drain system to balance the air pressure, preventing the water in the traps from being siphoned off. Back to alphabetical list

Water Hammer Arrestor
A device installed near a fixture to absorb the hydraulic shock that happens when a fixture's supply is suddenly shut off, causing water hammer, a loud banging noise in the pipes. Back to alphabetical list

Wye Fitting
A drain fitting that allows one pipe to be joined to another at a 45-degree angle. Back to alphabetical list

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