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Old 08-22-2019, 10:54 AM   #1
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Air Admittance Valve

Is there a way to test air admittance valve? I suspect mine to my gray tank is not working at times. Just spend the $20 or so and change it?
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Old 08-22-2019, 11:03 AM   #2
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I don't know of an easy way to test the valve, but I replaced mine last Friday. It cost $4.20 from Ace Hardware. Mine was the screw in type, 1 1/2 inch. Took me about 45 seconds to change out.


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Old 08-22-2019, 11:38 AM   #3
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You can grease the rubber flapper inside it too. Otherwise just search aav valves and you might find some sort of test. Probably easier to just buy one. I think mine was 5 bucks or so at ACE as well.
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Old 08-22-2019, 06:35 PM   #4
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Just apply very low pressure to the valve from the threaded end. If you clean it thoroughly, just blow into the threaded end, any resistance means it is working. Then again, less than $10 may be more palatable.
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Old 08-22-2019, 07:02 PM   #5
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If your gray tank isn't draining properly take a look at your roof vent. Your air admittance valve should only vent the sink drain. Both your gray and black tanks should have a roof vent.
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Old 08-23-2019, 06:28 AM   #6
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Just apply very low pressure to the valve from the threaded end. If you clean it thoroughly, just blow into the threaded end, any resistance means it is working. Then again, less than $10 may be more palatable.
Yeah, just wrap your lips around that air admittance valve (also called a sewer valve) and give it a blow. I'd just spend a few bucks and get a new one.
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Old 08-23-2019, 06:35 AM   #7
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Is there a way to test air admittance valve? I suspect mine to my gray tank is not working at times. Just spend the $20 or so and change it?
It's a one way value. Put water in the the value it should leak through but only one direction. So perform the water test from both sides, if it leaks in both directions it's bad
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Old 08-23-2019, 06:46 AM   #8
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Just replaced both of mine last week, easiest fix I've had to do. Both of them were seized up with a black goo like substance, have no idea what it was. The threads were also covered with what looked like Vasoline.... probably something the last owner tried. Replacing them sure got rid of the smell though!
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Old 08-23-2019, 08:32 AM   #9
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Water is a lot heavier than air, so a "water test" will push the valve open or closed where air will not. The pressures an AAV is supposed to work on are under 1 psi in most cases.
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Old 08-23-2019, 08:37 AM   #10
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Old 08-23-2019, 09:12 AM   #11
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Thanks for the replies. I pulled the $20 figure out of thin air, just WAG. I'll pick one up.
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Old 08-23-2019, 10:38 AM   #12
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Actually a $20 Oatey ? ? is probably a better deal than a $5 'Smiling Dragon' type from Wally, if you are not planning to sell your rig.
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Old 08-23-2019, 12:13 PM   #13
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Rubber band a plastic bag over the suspected AAV


Smell go away.replace the AAV


Still stinks......not that AAV but something else




Most black screw on types (el cheapo RV MFG s use) are just a flapper held closed by a tang
When dumping waste tank negative pressure in sink drain line will pull the flapper down (open) and over time the tang stretches ---hence will not pull tang closed tight


AAVs are in sink drain lines AFTER the 'P' traps so they do not get sucked dry from the negative pressure when dumping waste tank....hence the Air Admittance nomenclature
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Old 08-23-2019, 01:43 PM   #14
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Home depot has better ones:


https://www.homedepot.com/b/Plumbing...s/N-5yc1vZca2v
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