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Old 10-24-2014, 01:34 PM   #15
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Air Admittance Valves (AAVs) are negative pressure-activated, one-way vents, used in a drainage system to eliminate the need for passive pipe venting and unsightly, costly roof penetrations.
See: http://www.diydata.com/plumbing/air_...ance_valve.php
In an RV if the seal fails odor from the sewer tank can enter the living area of the RV.
Mel S
Thanks Mel for the information. Is it possible to visually see that the seal has failed?
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Old 10-24-2014, 01:42 PM   #16
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Thanks Mel for the information. Is it possible to visually see that the seal has failed?
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Not really.
If you have a sewer odor in a cabinet below a sink where an AAV is used, just replace it.
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Old 10-24-2014, 09:52 PM   #17
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"just replace it".
it's very inexpensive and easy to change. home depot has one for $5.99.
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Old 10-25-2014, 01:07 AM   #18
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Here is what it looks like. Just replaced two which solved our odor problemClick image for larger version

Name:	ImageUploadedByiRV2 - RV Forum1414217231.365095.jpg
Views:	123
Size:	831.9 KB
ID:	77344
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Old 10-27-2014, 05:32 PM   #19
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Thanks everone. I run water down the gray water vent pipe on the roof, no more smell.
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Old 10-29-2014, 09:38 PM   #20
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Interesting reading... Never knew these valves existed...
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Old 10-30-2014, 07:47 AM   #21
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Here is what it looks like. Just replaced two which solved our odor problemAttachment 77344
I have the problem in that they didn't leave enough room in my Dutch Star to be able to unscrew it. It hits the underside of the sink before it's fully unscrewed. The only remedy is to loosen the sink which will in turn tear up the wallpaper since it's so tight to the surrounding wall.
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Old 10-30-2014, 07:54 AM   #22
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I have the problem in that they didn't leave enough room in my Dutch Star to be able to unscrew it. It hits the underside of the sink before it's fully unscrewed. The only remedy is to loosen the sink which will in turn tear up the wallpaper since it's so tight to the surrounding wall.

Is the standing pipe long enough to cut it off below the existing fitting? If so just cut the whole assembly off at a workable length and replace the whole assembly.


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Old 10-30-2014, 07:59 AM   #23
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Interesting reading... Never knew these valves existed...
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Air admittance valves are a "short cut" often used by RV manufacturers, (however NOT ALL RVs have air admittance valves in the drain plumbing).
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Old 10-30-2014, 08:09 AM   #24
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Is the standing pipe long enough to cut it off below the existing fitting? If so just cut the whole assembly off at a workable length and replace the whole assembly.


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I don't get along with plumbing problems very well, but I do believe that's the remedy. I'll give it a shot once were settled for the winter. But of course we only get the smell when going down the road.
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Old 10-30-2014, 08:17 AM   #25
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I don't get along with plumbing problems very well, but I do believe that's the remedy. I'll give it a shot once were settled for the winter.

I feel your pain! The biggest issue is access to the pipe. I'm an old fat guy and crawling up under the sink is a lot tougher than it once was. If you have an electric saber saw of some type it's easier. It's doable with a PVC hand saw but it'll take more beer. If you do it, I recommend springing for one of the higher priced ones at Lowes or Depot. It's better than doing the job again.


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Old 10-30-2014, 01:17 PM   #26
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We had a seemlier problem this year and it was one of the battery s cooking.
Installed a battery shut off and solved the smell.
I think it is the inverter.
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Old 10-30-2014, 02:17 PM   #27
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We had a seemlier problem this year and it was one of the battery s cooking.
Installed a battery shut off and solved the smell.
I think it is the inverter.
Tim
Tim
That's like putting a band-aid on a broken leg.
If one of the "batteries is cooking"... that "problem" should be corrected.
A "battery shut off" only covers up the real problem.... it does NOT FIX the "battery/inverter/charger problem".
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Old 10-30-2014, 02:27 PM   #28
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You are correct Sir, I'm sorry I didn't add that but yes we have had it corrected since then. Sorry man and to the OP.
Tim,
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Is it Friday yet?

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