Pool pump check valve - Toilet cistern valve - Fumoto engine oil drain valve.

Pool Pump Check Valve

check valve
Limits the flow of gas to one direction only. Use a check valve between the bubbler and generator to prevent unwanted pressure build up in the generator, and a safety against a low level bubbler. A check valve, such as used on torches, is recommended.
A check valve, clack valve, non-return valve or one-way valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction.
A valve that closes to prevent backward flow of liquid
A mechanical device in a pipe that permits the flow of water or air in one direction only.

pool
combine into a common fund; "We pooled resources"
an excavation that is (usually) filled with water
Share (things) for the benefit of all those involved
(of two or more people or organizations) Put (money or other assets) into a common fund
join or form a pool of people

pump
deliver forth; "pump bullets into the dummy"
A woman's plain, lightweight shoe that has a low-cut upper, no fastening, and typically a medium heel
a mechanical device that moves fluid or gas by pressure or suction
operate like a pump; move up and down, like a handle or a pedal; "pump the gas pedal"
A man's slip-on patent leather shoe for formal wear
A light shoe, in particular

Veteran's Municipal Pool - LaSalle, IL
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