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Old 07-24-2018, 09:52 PM   #1
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No air admittance valve

We had a smell in our bathroom while traveling, and I looked under the sink and did not see the valve. It is just a pipe extending up with a cap on it. I can twist the cap both ways, but it does not come off. Is this something new, or did they forget to install one? Same under the kitchen sink.
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Old 07-24-2018, 10:01 PM   #2
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To me that sounds like the air admittance valve, that's the way mine looked in our 5er. Now if it is stuck open it is as if there is nothing on the pipe.
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Old 07-24-2018, 10:05 PM   #3
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I suggest you look up what an AAV (cheater vent) looks like online and see if it matches what you are twisting. Most AAV I've used have screw threads that fastens it to a threaded end on the PVC drain pipe. The threaded end is usually glued on the end of the pipe.

Do you have a tank flusher on your black tank? They also are plumbed with a vacuum breaker to prevent backflow or contamination of the water hookup. If it fails it also can let sewer gas into the RV.
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Old 07-24-2018, 10:51 PM   #4
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Typical AAV used ---better one available



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Old 07-25-2018, 05:23 AM   #5
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If you don't have admittance valves on your bath and kitchen sinks, they need them. Most likely what you see is the valve. My "No Fuss Flush" valve for the tank flush is buried in a wall behind an overhead cabinet in the bath. Had to replace my No Fuss Flush, started leaking water, no smell though.


If my coach has been setting for a while, I will get odor from gray/black tank when I do get on the road. Running water in the sink and shower will stop it. The P-traps dry out over time and allow gas to escape.
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Old 07-25-2018, 10:35 AM   #6
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AAV

Here are two pictures of what I have.
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Old 07-25-2018, 05:00 PM   #7
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Quote:
Originally Posted by Teblues View Post
Here are two pictures of what I have.

My guess is glue on Air admittance valves.
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