WH - White finish
Wall Thickness - The thickness of the tubing wall.
Wash-down Water Closet - Water closet having a siphon trapway at the front of the bowl, and integral flushing rim.
Waste Arm Drain - An extension pipe, usually to extend a sink drain into a wall.
Waste & Overflow Drain - An assembly for a bathtub. The outlet at the top removes the overflow water during tub filling and the drain at the bottom removes wastewater when the tub is drained.
Waste Plug - Drain stopper on a bathtub drain.
Waste Shoe - Bathtub drain assembly.
Waste Stack - See Soil Stack. The vertical main pipe in a drainage system, extending one or more stories.
Waste Closet / WC - 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 shutoff of water.
Water Hose 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.
Weak Well - Weak well application occurs when the pump lowers the water level 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.
Whirlpool Tub - A bathtub with circulation jets in various spots throughout the tub that provide therapeutic massaging action.
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.
Source: "Plumbing Terms" Standard Plumbing Supply. 11 Sept. 2008
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