Plumbing
ABS
Acrylonitrile-butadiene-styrene. Used for drain and vent lines.
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Aerator
The system of screens screwed into the spout of most faucets. The
aerator helps control the flow of water and keep it from splashing
all over. They frequently contain a baffle to help reduce the flow
of water to the mandated 2.5 gallons per minute. Back
to alphabetical list
Air
Admittance Valve (AAV)
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. Back to alphabetical list
Airgap
In the drainage system, the unobstructed vertical opening between
the lowest opening of a waste line and the flood level of the device
into which it empties. Purpose is to prevent backflow contamination.
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Anti-scald
Valve
See Pressure-balancing Valve
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Backflow
Preventer
A device that prevents wastewater and other contaminants 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. Back to
alphabetical list
Ballcock
A valve operated by a float, such as a floatball or a float-cup
in a toilet tank. Back to alphabetical list
Branch
Any part of the drain system other than the main, riser, or stack.
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Bushing
A pipe fitting used to join two pipes of different sizes. A bushing
is threaded inside and out. Back to alphabetical
list
Check
Valve
A type of backflow preventer installed in a pipe run that allows
water to flow in only one direction. Back to alphabetical
list
Cleanout
A pipe fitting with a removable plug for inspecting and cleaning
out drain pipes. Back to alphabetical list
Closet
Bend
The curved section of drain pipe located immediately below the toilet.
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Closet
Flange
A round, flat fitting that attaches to the closet bend. The heads
of closet bolts, used to secure the toilet in place, insert
into slots in the closet flange. Back to alphabetical
list
Coupling
A
short fitting used to join two pieces of pipe. Back
to alphabetical list
CPVC
Chlorinated polyvinyl chloride. Used for water supply. Back
to alphabetical list
Cross-connection
Any connection or situation that may allow waste water to enter
the supply system. Back to alphabetical list
Drain
Any pipe that carries wastewater or water-borne waste. Back
to alphabetical list
DWV
Drainage, waste, and vent. Back to alphabetical
list
Elbow
Curved
fittings, usually 90° or 45°, used to change the direction of a
pipe run. Also called "ells." Back to alphabetical
list
Escutcheon
A decorative or protective plate. In plumbing, the plate behind
or under a fixture that covers the hole around the pipe or valve.
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