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A one way valve is a simple mechanism which can be fitted in any pipe. The way it works is that there is a flap in the pipe which can be made out of rubber or something waterproof that will block the water or air from returning back. The flap is fitted inside the pipe and when the water comes in with pressure the flap opens allowing it to go but when the air or water is returning the flap closes and cannot move on the other side because it is blocked usually by a metal disk.

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