Acrylonitrile-butadiene-styrene. Used for drain and vent lines.

An opening in the wall or ceiling near the fixture that allows access for servicing the plumbing/electrical system.

The system of screens most faucet spouts that help control the flow of water and keep it from splashing. They often contain a baffle to help reduce the flow of water to the mandated 2.5 gallons per minute.

A device that replaces a traditional vent to allow air to enter the pipe and equalize pressure, preserving the seal of water in the fixture trap.

The unobstructed vertical opening in the drainage system between the lowest opening of a waste line and the flood level of the device into which it empties. Its purpose is to prevent backflow contamination.

The amount of heat required to raise the temperature of one pound of water, one degree Fahrenheit.

A device that prevents wastewater from flowing into the potable water supply. Generally required for sprinkler systems, hand-held showers installed in bathtubs, faucets with pullout spouts, kitchen sprayers, and the like.

A valve operated by a float, such as a floatball or a float-cup in a toilet tank.

A hot water or steam heating unit. A boiler can be heated with Natural Gas, LP Gas or Oil.

Any part of the drain system other than the main, riser, or stack.