Piping a gray water pump under utility sink


Old 05-20-16, 06:46 PM
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Join Date: Jan 2014
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Piping a gray water pump under utility sink

So I was about to get started piping the discharge and vent piping from my Liberty gray water pump which is going underneath a new utility sink.
My question is, can I run one pipe out and do a wet vent with a gray water pump? I would then plug the extra tap on the pump?

I have a spare drain with its own vent ran up through the roof already. The drain was from a 1st floor washing machine that indisconnected. The drain is now there capped off which T's into the vertical vent pipe. So it was used as a wet vent for the washer.

If possible I would like to reconnect my pump to this drain and use the vent as well. I'm just not sure if the gray water pump can run like this, or does it need a separate discharge and vent pipe?
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Old 05-20-16, 08:04 PM
Join Date: May 2015
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Don't think you can wet vent it. As the water gets pumped out, air has to replace it. It can't come down the outlet because the pump is running and it's full of water, so it will come from the inlet, which will suck the trap dry.
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