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Old 10-19-2011, 11:13 AM   #15
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Check all the vacuum breakers under the sinks - one of them is probably stuck open. And add one of the vent stack gadgets too - can't hurt!
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Old 10-19-2011, 11:27 AM   #16
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Close your window while driving.
I had the same problem and found bubbles coming up through the water in the toilet bowl. Closed the window and all stopped.
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Old 10-19-2011, 11:38 AM   #17
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Thanks for the idea. We will look into this.!!!

Quote:
Originally Posted by DBeauchamp View Post
If it's not the stack and if your kitchen sink is in a slide, there is a good chance it is vented "inside" under the sink just above the P trap with an "automatic vent". If this vent is stuck opened that would be a good source of stinky smell. Here is a good explanation of how they work:
Old plumber talks about an automatic air vent. Venting plumbing fixtures. - YouTube
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Old 10-19-2011, 07:24 PM   #18
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I had the same problem. I pulled the toilet to check the fit and noticed that the seal was one of those sponge rubber seals. I discarded it and replaced with a wax seal. The problem has not come back since.
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Old 10-20-2011, 12:11 AM   #19
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Quote:
Originally Posted by DBeauchamp View Post
In fact I use regular toilet paper, not the $4 per roll type that is "recommended" for RV's...
I've done that for 50+ years and never had a problem.
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Old 10-20-2011, 12:12 AM   #20
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Quote:
Originally Posted by Gary RVRoamer View Post
Check all the vacuum breakers under the sinks - one of them is probably stuck open. And add one of the vent stack gadgets too - can't hurt!
I've had the vacuum breakers stick open twice. First one was replaced under warranty, the last one I just removed, cleaned and lubed it.
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Old 10-20-2011, 08:53 PM   #21
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Placing a ziplock bag of water over the shower drain when driving solved our problem.The vacuum would drain the trap allowing fumes to come into the motorhome.

Bob
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Old 10-21-2011, 09:55 AM   #22
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I am adding the cyclone covers to my vents. I noticed that I have 3 vents. 1 is for sure the black tank and I put the cyclone cover on it. But could the other 2 be for the grey tank. Im pretty sure I dont have 2 grey tanks on my Astoria. If they both vent the grey tank do I need cyclone covers on both or is just one good enough?
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Old 10-21-2011, 10:52 AM   #23
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The third one might be the kitchen sink. Pretty sure my 5er had one.
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Old 11-21-2011, 11:24 PM   #24
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yup one is for your galley water. I would think that you would need only one of the cyclone vents for your black water tank.
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Old 11-22-2011, 04:21 AM   #25
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I checked out the one in the galley and it holds water. Will see how it does on the way home from the dunes.
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Old 11-22-2011, 06:56 AM   #26
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Lightbulb Cool Idea

Quote:
Originally Posted by bldrbob View Post
Placing a ziplock bag of water over the shower drain when driving solved our problem.The vacuum would drain the trap allowing fumes to come into the motorhome.

Bob

Great idea

The more I think of the problem, if it's truly coming from the bathroom, it's possibly a vent on the sink drain. Trace along the sink drain pipe with your hand. Another section should branch off and terminate with a screw-on cap. That's a flapper valve. Gently unscrew it, notice the rubber disc inside. Chances are, it's folded, torn or missing.

Mine are labeled Add-A-Vent, but I cannot find a replacement listed.
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Old 11-22-2011, 07:18 AM   #27
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Home Depot:
1-1/2 in. ABS PTC In-Line Cheater Vent-39012 at The Home Depot

It's called an automatic vent and it is the vent in the above video.
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Old 11-22-2011, 09:31 AM   #28
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My bathroom one must be behind a panel in the room where the tub/shower is. It is not under the sink across from that room.
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