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Plumbing Terminology
Extensive Online Plumbing Dictionary

Click on any letter of the term you would like to find
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Wall Bracket:
An adjustable bracket which attaches to a slide bar or hanger allowing the user to pivot and rotate the position of a handshower.


Wall-Mount Sink:
Type of installation in which a lavatory is supported from the wall.


Wall Thickness:
The thickness of the tubing wall.


Washdown Water Closet:
YY.


Waste and Overflow:
The drain assembly for a bathtub. The outlet at the top removes the "overflow" water during tub filling and the drain at the bottom removes "waste" water when the tub is drained.


Waste Arm:
Drain extension pipe, usually to extend a sink drain into a wall.


Waste Plug:
Drain stopper on a bathtub drain.


Waste Shoe:
Bathtub drain assembly.


Waste Stack:
YY.


Water Closet:
A toilet.


Water Hammer:
A loud banging noise caused by the hydraulic shock of suddenly shutting off a water supply, where water moves against the side of containing pipe or vessel.


Water Hammer Arrestor:
A device installed near a fixture to absorb the hydraulic shock caused by a sudden shut off of water.


Water Horse Power (WHP):
The calculated horse power produced by the pump using the formula WHP = head x gpm/3960.


Water Service Pipe:
The pipe from the water main or other sources of potable water supply to the water distributing system of the building served.


Water Spot:
Water surface in the toilet bowl once the flush is completed.


Water Table:
Level below the earth's surface at which the ground becomes saturated with water.


Waterway Fitting:
A channel through which water can flow; connects water heater to inlet and outlet lines.


Watt:
A unit of electrical energy or power. One ampere x one volt equals one watt.


Watt Density:
Amount of watts concentrated per square inch of element blade surface area.


Wave Washer:
A washer, common in drain linkages, which provides pressure against a ball or other mechanism even when the opposing nut is not fully tightened.


Wax Ring:
Located between floor flange and toilet as a seal to prevent leakage and fumes.


WC:
Water Closet.


Weak Well:
Weak well application occurs when the pump lowers the water lever in the well faster than the well can replenish itself.


Weir:
A long notch with a horizontal edge, as in the top of a vertical plate or plank, through which water flows, used in measuring the quantity of flowing water.


Well Casing:
A steel or plastic pipe inserted into a drilled well to prevent dirt and debris from contaminating the water.


Wellpoint:
A pipe fitted with a driving point and a fine mesh screen used to remove underground water. A complete set of equipment for drying up ground including wellpoints, connecting pipes and pumps.


Wet Vent:
Drain or waste pipe that also acts for one or more fixtures on the same line.


WH:
White.


Whirlpool Tub:
A bathtub with circulation jets in various spots throughout the tub that provide therapeutic massaging action.


Whole House Trap:
Also known as a main line trap. Normally an in-line "running" trap utilizing a "U" shaped fitting with a vent.


Widespread:
A style of bathroom lavatory faucet having separate spout and handles, usually 8" from center of handle to handle.


Working Pressure:
Maximum pressure of the operating system permissible.


Working Water:
Water used in a home for most general purposes including bathing and laundering.


Wrought Copper Fittings:
Plumbing fittings used to connect copper tubes made of mechanically worked and toughened copper as opposed to an as-cast brittle copper.


Wye:
A Y-shaped fitting with three openings used to create branch lines. Allows one pipe to be joined to another at a 45 degree angle.


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