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| V-Clip |
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A clip shaped like the letter "V" used on a lavatory drain lift linkage assembly to easily adjust connection of the drain to the lift rod. |
| Vacuum Breaker |
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An anti-siphon device that prevents the backflow of contaminated water into the water supply system. |
| Valve |
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 A device that regulates the flow of water |
| Valve Dressing |
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Resurfacing a worn valve seat with a special tool. Stops leaks by providing a smooth sealing surface. Applies only to older compression style faucets. |
| Valve Seat |
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The non-moving part of a valve. Water flow is stopped when the moveable portion of the valve comes in contact with the valve seat. |
| Valve Seat Wrench |
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Hexagonal end wrench inserted into the hexagonal opening in a valve seat for installing or removal. |
| Vanity |
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A bathroom storage cabinet under the wash basin. |
| Velocity Head |
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The amount of energy required to accelerate water to a given velocity; expressed in feet per head |
| Vent |
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 A pipe that allows air into a drain system to balance the air pressure, preventing water in the traps from being siphoned off. |
| Vent Header |
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A vent pipe into which several vents connect. The vent pipe leads to the vent stack and out of the building. |
| Vent Stack |
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Upper portion of the soil stack above the topmost fixture through which gases and odors escape. |
| Venting Materials |
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Materials used for venting, i.e. PVC, CPVC, ABS, metal. |
| Venturi |
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A short tube with a tapered constriction in the middle that causes an increase in the velocity of flow of a fluid and a corresponding decrease in fluid pressure and that is used for creating a suction in a vacuum pump |
| Viscosity |
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The resistance of fluids to flow, due to internal forces and friction between molecules, which increases as its temperature decreases. |
| Vitreous Surface |
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Surface material on some plumbing fixtures derived from or consisting of glass, translucent, and low on porosity. |
| Vitreous China |
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Ceramic materials fired at high temperature to form a non-porous body, having exposed surfaces coated with ceramic glaze fused to the body. This is used to form bathroom fixtures such as toilets, bidets, and lavs. |
| Volatile |
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Capable of vaporization at a relatively low temperature. |
| Volt |
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Unit of measure of electromotive force |
| Volumetric |
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Referring to measurement by volume rather than weight. |
| Volute Casing |
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Derives is name from a spiral shaped casing surrounding the pump impeller. It converts velocity energy to pressure energy. |
| Voral Tube |
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Flexible steel hose used for hand-held shower sprays. |
