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Plumbing Glossary

A Valve
A manual gas shut-off valve.
Acrylonitrile Butadiene Styrene, a stiff black plastic pipe and fittings used for drain, waste, and vent lines.
Absolute Pressure
Atmospheric pressure added to gauge pressure.
Absorption Field
A leech field engineered to receive septic tank sewage.
Thermoplastic used on the surface of bathtubs and whirlpools. Usually comes in sheets and is combined with fiberglass to create shower walls.
A fitting that joins two different types of pipes together.
Adjusting Link
An adjustable strap/ bar, which forms a connection between the lift rod of a faucet and the ball lever of the drain
A device screwed into a faucet spout, which mixes air into running water to control flow and reduce splashing
Air Admittance Valve
A mechanical valve used to replace a traditional vent to allow air to enter the waste pipe and equalize pressure. It also preserves the seal of water in the fixture trap.
Air Chamber
A vertical, air-filled pipe or spring coil, set above the water line to absorb pressure when water is turned off at the faucet. Used to eliminate water hammer.
Air Gap
An air-filled space, which allows contaminated water to discharge freely while preventing the contaminated water from siphoning back into the potable water supply
Air Lock
A blockage in the flow of liquid.
Air Volume Control
Maintains the air charge in a standard water storage tank. Note: Pre-charged tanks do not require an air volume control.
The measurement of elements in a water supply, which determine alkaline conditions; the measure of its capacity to neutralize acids
Ambient Temperature
The average temperature of the atmosphere in the vicinity of an appliance.
A patented process that uses a porcelain surface, an enameling grade steel material and a structural composite backing bonded together to create a sink that is similar to cast iron in durability but weighs considerably less
Angle Seat Wrench
Valve seat wrench with a handle that includes a 90 degree bend.
Angle Stop
A shutoff valve between the water pipes and a faucet. Usually used to shut off water to a fixture in case of an emergency repair.
Angular Discharge Tube
A discharge tube that changes the direction of water flow to approximately 90 degrees.
Anode Rod
A rod within a water heater, composed of one or more metals to protect the tank from corrosion; it helps prolong the life of the tank
Anti-clog Suction
A whirlpool water recirculating system, which prevents clogging without restricting the water flow
Used to prevent the backflow of liquid into a system.
The apron, or skirting, a decorating portion of a bathtub that covers the rough-in area from the floor to the top rim of the tub. It is often sold separately from the tub.
A thermostat that is submerged in water.
A layer or zone below the surface of the earth which is capable of yielding a significant volume of water. The upper level of the aquifer is called the water table.
Arrow Head
A heavy duty auger cable tip.
A flexible rod with a curved end used to access the toilet's built-in trap and remove clogs.
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