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Anti Siphon Vacum Breaker

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I Have a 2008 Monaco Knight, I noticed a puddle of water on the floor by the hall 1/2 bath. Upon inspection I found that water was leaking from under the sink in the 1/2 bath coming from a valve called Anti Siphon Vacuum Breaker. The leak was under the chrome cap on top of this valve. I purchased a replacement valve and after installing the new valve I found that it is also leaking. Could someone maybe point me in the right direction to look as to why this valve is leaking.

Thanks

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Its purpose is to let air in (to break any siphon affect). Most are installed high enough under the cabinet there they are above the water level.

Yes, they should not leak water, but if you have room above it to extend the pipe and mount it higher, that would be my suggestion.

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Maybe you have a partial clog downstream from the air admittance valve that raises the water level high enough to flood the valve.

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