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Old 07-29-2012, 08:29 PM   #1
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Combined Grey/ Black Tank Vents

i have a 2012 Thor Daybreak that only has one tank vent up on the roof. my guess is that both the black and grey tanks vent into a combined pipe that exits through the roof. can any thor/damon owners confirm that to be true? i was surprised that there was only one, but that has to be it. i can't imagine where else the other vent would be if not.
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Old 07-30-2012, 06:19 AM   #2
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Are the tanks side by side on the underside then they might share the same vent if the manfacture did that they should have went up to atleast a 2 inch pipe. the vent in the tank allow air to get out so liquid can get in, the fixtures are vented from vents built in the plumbing under the sinks
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Old 07-30-2012, 07:28 AM   #3
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Quote:
Originally Posted by RESharp001 View Post
i have a 2012 Thor Daybreak that only has one tank vent up on the roof. my guess is that both the black and grey tanks vent into a combined pipe that exits through the roof. can any thor/damon owners confirm that to be true? i was surprised that there was only one, but that has to be it. i can't imagine where else the other vent would be if not.
yep, i have the same MH and it has the same one vent for the tanks. but, that is no different than the old Bounder i had. since the tanks are adjacent to each other, they share the same vent. isn't anything to worry about.
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Old 07-30-2012, 09:47 AM   #4
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One thing most folks do not know less they look is the vent pipe is a whole bunch smaller than the vent, ,It would be very easy to combine the two vent pipes into one larger pipe and still be "Vent size" at the roof. Might actually be a better way to do it in my not very humble opinion.
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Old 07-31-2012, 06:13 AM   #5
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Thanks for the input. When I replaced the factory vent cap with the Siphon 360 I did notice that the vent pipe was 2". Since there was no other logical place to vent I figured this must be what they did but there was no way to visually confirm as there is no access to the top of the holding tanks that I see. One can only see that the tanks are side-by-side from below. I guess I can send the 2nd Siphon 360 back and get $30 back since I don't need it. I had originally ordered two of them as there were 2 vent caps up on the roof. One of the caps was in the middle of the unit and didn't make much sense how something could be vented there, but turns out it is where the wiring for a satelite dish is. I guess the manufacture just covers that with a vent for lack of anything better. You had to cut the roof seal to access it so the vent was really just a dummy.
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Old 07-31-2012, 06:20 AM   #6
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yep, i have the same MH and it has the same one vent for the tanks. but, that is no different than the old Bounder i had. since the tanks are adjacent to each other, they share the same vent. isn't anything to worry about.
Do you have any grey tank odors entering the coach while using the shower? We never had any problems in our old coach but with this one it's terrible. It's only when the shower is in use. When I removed the factory vent cap I noticed that hole cut in the roof to run the vent pipe up through was about 4" but the pipe was only 2" leaving a solid 1" of open space all the way around the pipe. My guess is that normal use of the sink never put enough water in the tank and didn't force enough gas up the pipe to make a difference, but that while shower there was a lot more water entering the tank and gas venting from the tank. By the design of the factory caps, I think there was so much gas exiting that it went up the stack, hit the top of the cap, and a lot of it was deflected back down into that 1" open space around the pipe. I think the Siphon 360 design is a lot better and the gas should come up and directly out of the stack without being deflected back down. If that doesn't solve the problem I guess I'll set out to fill in that gap with an insulation foam or something.

I'm just curious if you've noticed a smell on yours since you have the same coach.
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