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Old 05-11-2014, 07:13 PM   #1
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1965 24' Tradewind
Pleasant Ridge , Michigan
Join Date: Jun 2012
Posts: 13
Sink drain vent question

Hi everyone! Making progress on our 65 TW thanks to the great info on this site.

We are planning the kitchen right now and I am trying to find a way to delete/reroute the kitchen sink drain vent so we can have a contiguous countertop run on that side. The old design obviously had the vent pipe ground up through the roof. Is it possible to vent it through the side of the trailer?

I have seen custom kitchens that do not appear to have a vent at all... Is it alright to have no vent at all?

Our cabinets with countertops will be pretty tall - almost up to the windows (approx 40" tall).


Chad & Kir

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Old 05-11-2014, 07:25 PM   #2
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1972 31' Sovereign
Lexington , Minnesota
Join Date: Feb 2009
Posts: 3,157

Do you have a gray tank, and is it vented separately through another vent pipe? If not, it should be. If it is vented via another vent pipe, then you can use an air-admittance valve under the counter to vent the kitchen sink. This is a under the counter one-way valve that will let air into the drain system, but not let sewer gas back out.

The purpose of the sink vents is to allow air in to run behind the water so the drain drains properly. The tank vent allows air to escape the tank when water flows in, as well as allowing air into the tank while you drain it. Another function of the tank vent is to allow sewer gasses to escape. Typically, those are stinky, even for a gray tank, so you really want the tank vent going up and out the roof.

Make sense?


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Old 05-11-2014, 07:52 PM   #3
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1965 24' Tradewind
Pleasant Ridge , Michigan
Join Date: Jun 2012
Posts: 13
Hi Chris,

We are planning on only using a grey tank, and it will be vented at the shower/bathroom sink. There was anther vent on the other side of the toilet back there which I believe vented the black tank; either way we'll vent the tank and shower/bathroom sink.

I'll look into the air admittance valve. Seems like a good solution.

Thanks for your help!
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