The non-moving part of a valve. Water flow is stopped when the moveable portion of the valve comes in contact with the valve seat.

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

A vent pipe into which several vents connect. The vent pipe leads to the vent stack and out of the building.

Upper portion of the soil stack above the topmost fixture through which gases and odors escape.

A vent is a pipe or pipes instalto provide a flow or air to or from a drainage system to provide a circulation of air within such system to protect trap seals from siphonage and back-pressure.

A short tube with a tapered constriction in the middle that causes an increase in the velocity of flow of a fluid and a corresponding decrease in fluid pressure and that is used for creating a suction in a vacuum pump.

The resistance of fluids to flow, due to internal forces and friction between molecules, which increases as its temperature decreases.

Ceramic materials fired at high temperature to form a non-porous body, having exposed surfaces coated with ceramic glaze fused to the body. This is used to form bathroom fixtures such as toilets, bidets, W/c's and basins.

Usually a brass casting that holds both the hot and cold valves and the mixing chamber for the water. May also refer to an assembly of copper or other metal which serves the same function.

A yoke vent is a pipe connecting upward from a soil or waste stack to a vent stack for the purpose of preventing pressure changes in the stacks.