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Vacuum Breaker:
An anti-siphon device that prevents the back flow of contaminated water into the water supply system in the event of a negative pressure condition.


Valve:
A device that regulates the flow of water. Also the rough-in part of a faucet that is concealed in a wall or undercounter.


Valve Dressing:
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:
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:
Hexagonal end wrench inserted into the hexagonal opening in a valve seat for installing or removal.


Vanity Top:
Bathroom cabinet with a wash basin set in the top.


V-Clip:
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.


Velocity Head:
The amount of energy required to accelerate water to a given velocity; expressed in feet per head.


Vent:
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:
A vent pipe into which several vents connect. The vent pipe leads to the vent stack and out of the building.


Vent Stack:
Upper portion of the soil stack above the topmost fixture through which gases and odors escape.


Venting Materials:
Materials used for venting, i.e. PVC, CPVC, ABS, metal.


Venturi:
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.


Vessel Sink:
A lavatory, reminiscent of china washbasins with finished inside and outside walls, that is designed to sit on the countertop.


Viscosity:
The resistance of fluids to flow, due to internal forces and friction between molecules, which increases as its temperature decreases.


Vitreous:
Surface material on some plumbing fixtures derived from or consisting of glass, translucent, and low on porosity.


Vitreous China:
Ceramic materials fired at high temperature to form a non-porous body, having exposed surface coated with ceramic glaze fused to the body. This is used to form bathroom fixtures such as toilets, bidets, and lavs.


VOCs:
Volatile Organic Compounds - Chemicals that can be found in drinking water and can cause cancer and many other dangerous health effects.


Volatile:
Capable of vaporization at a relatively low temperature.


Volt:
Unit of measure of electromotive force.


Volumetric:
Referring to measurement by volume rather than weight.


Volute Casing:
Derives its name from a spiral shaped casing surrounding the pump impeller. It converts velocity energy to pressure energy.


Voral Tube:
Flexible steel hose used for hand-held shower sprays.


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