Plumbing glossary: W

WPJ Heating is possibly the most important term to know when you’re in need of a professional plumbing service, but in case you’re looking to take your plumbing knowledge even further, our plumbing glossary covers all of the other important W-words.

WCWater Closet – toilet

Wall thickness – the thickness of the tubing wall

Waste arm drain – an extension pipe usually used to extend a sink drain into a wall

Waste and overflow drain – an assembly for a bathtub – the outlet at the top removes 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 – main vertical pipe in a drainage system, extending one or more stories

Water hammer – loud banging noise caused by hydraulic shock that occurs when water supply is suddenly shut off, resulting in water moving against the side of containing pipe

Water hammer arrestor – device installed near fixture to absorb hydraulic shock of abrupt water shutoff

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

Water service pipe – pipe from the water main

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, connecting water heater to inlet and outlet lines

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

Weak well – application occurs when the pump lowers the water level in the well faster than the well can replenish itself

Weir – long notch with horizontal edge used to measure the quantity of flowing water

Well casing – steel or plastic pipe inserted into a drilled well to prevent dirt and debris from contaminating the water

Well point – pipe fitted with driving point and a fine mesh screen used to remove underground water

Wet vent – drain or waste pipe that also acts for one or more fixtures on the same line

Working pressure – maximum pressure of the operating system permissible

Wrought copper fittings – plumbing fittings used to connect copper tubes made of mechanically worked and toughened copper

Wye – Y-shaped fitting with three openings used to create branch lines and allows one pipe to be joined to another at a 45-degree angle

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