How does plumbing vent system work? - Escape Trailer Owners Community

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Old 06-16-2015, 10:27 AM   #1
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How does plumbing vent system work?

Just wondering how the black and grey tank vent system work in my 2013 19'?

My furnace stopped working so I pulled it out last night and found a open vent inside furnace cabinet. The drain piping is coming from the bathroom sink and there is an open tee on the line. I assume this is the vent for the grey tank? I thought it would have vented to the roof or at least outside somehow. Is it normal for it just to be open like this to the inside of the trailer?

Photo of vent

I leave the shower drain plug installed when not in use so it looks like this vent would be the first point to overflow if the grey tank was overfilled. A very unfortunate place to have an overflow because there is no access.

Does the black tank vent through the round vent cap on the roof of the trailer?
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Old 06-16-2015, 11:24 AM   #2
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Not familiar with the 19, but I'd put in an ABS threaded cleanout-style cap to cap it off and send the pic to ETI asking about it. Our 21 has a flex hose venting from the ABS fitting up to the roof vent - maybe yours didn't get installed/connected?
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Old 06-16-2015, 11:33 AM   #3
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Our 5.0 SA has the same system, vented to the furnace compartment. Capping it would likely cause problems with draining.
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Old 06-16-2015, 01:08 PM   #4
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When we picked up our 19 a few weeks ago, Reace told us that there was this pipe and it was needed just in case the tank needed to vent and you closed the floor drain. He suggested that you should always leave the floor plug open when you travel so that water is not sloshed up through this vent and that it was only likely to happen when traveling with a full tank. I didn't ask why it was there without a cap or outside vent but that is a good question.
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Old 06-16-2015, 01:59 PM   #5
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I found the same open pipe. Easy solution is to purchase an Air Admittance Vent.
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Old 06-16-2015, 02:06 PM   #6
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When I had the 17 we were advised to travel with the floor drain plug CLOSED, so as not to slosh into the floor of the bathroom. That plumbing configuration may have been different, however. With the 19 we've continued the practice of keeping it closed. In looking at the photo, it appears the top of the TEE is well above the floor drain anyway, so it might not be a problem unless, as Reace told you, the tank is full. Is there room to add a length of pipe onto the TEE and still get the furnace back in?
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Old 06-16-2015, 02:22 PM   #7
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I remember something about IF the tank is full and you keep adding water to the sink it will backup to this pipe and run over onto the floor? The sink is higher then the pipe exit?

I was told to keep the bath drain tight or back slosh from the gray tank will come out when driving.
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Old 06-16-2015, 02:31 PM   #8
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Reace told me two weeks ago that he suggests leaving the floor vent open as it is better to slosh into the floor where it is contained than to have water come out the overflow pipe.
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Old 06-16-2015, 02:53 PM   #9
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Quote:
Originally Posted by santacruzer View Post
Is there room to add a length of pipe onto the TEE and still get the furnace back in?
Yeah, it should be easy to add a ~6" or longer nipple on top of the tee. Might not be necessary but might make me feel more comfortable about it since any water from the shower sink is draining right through this open tee.
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Old 06-16-2015, 02:55 PM   #10
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Quote:
Originally Posted by bdornbush View Post
Reace told me two weeks ago that he suggests leaving the floor vent open as it is better to slosh into the floor where it is contained than to have water come out the overflow pipe.
Yeah, I will think about leaving the shower drain plug out from now on . Better to have it back up into the shower than the furnace compartment.
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