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Old 07-27-2020, 09:00 AM   #1
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Gray tank stinks up the trailer

Just about everytime my graytank gets near 2/3 it starts stinking bad throughout the trailer.
I put gray tank deodorizers in there but it doesn't seem to matter. Anytime I use a sink it pushes the stink out.
Is this usual? Maybe my tank vent is clogged or improperly installed?
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Old 07-27-2020, 09:16 AM   #2
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Some rigs have a AAV valve inside the kitchen cabinets. Take a peek to see if it's not closing, allowing the gases to escape.
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Old 07-27-2020, 09:21 AM   #3
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Studor Valve. Look under the sink and bath sink. They go bad. Also use Happy Camper in the grey tank as well as the black.
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Old 07-27-2020, 09:21 AM   #4
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Some rigs have a AAV valve inside the kitchen cabinets. Take a peek to see if it's not closing, allowing the gases to escape.
I checked the valves thinking it may be leaking around them, the kitchen valve was barely screwed in but the bathrooms was tight and the bathroom stinks just as bad.
I imagine to see if they close you have to remove them completely? mine have covers over the top.
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Old 07-27-2020, 09:22 AM   #5
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Studor Valve. Look under the sink and bath sink. They go bad. Also use Happy Camper in the grey tank as well as the black.
It is a 2020 trailer but I suppose anything could happen with these.
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Old 07-27-2020, 09:26 AM   #6
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I checked the valves thinking it may be leaking around them, the kitchen valve was barely screwed in but the bathrooms was tight and the bathroom stinks just as bad.
I imagine to see if they close you have to remove them completely? mine have covers over the top.
You should be able to hear them open and close when water goes down the drain. Mine makes a type of gurgling noise as it opens and closes. If you don't hear anything, it could just be stuck open. Age has nothing to do with it, it's a cheap part that you can pickup at Home Depot.
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Old 07-27-2020, 09:53 AM   #7
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We make sure there is never any food or grease going into the gray, and have never had a smell from it.
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Old 07-27-2020, 12:01 PM   #8
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Studor Valve. Look under the sink and bath sink. They go bad. Also use Happy Camper in the grey tank as well as the black.
X2 on the stuck valves and definately on the Happy Camper. That's great stuff...
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Old 10-31-2023, 06:58 PM   #9
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Originally Posted by m2bandit View Post
Just about everytime my graytank gets near 2/3 it starts stinking bad throughout the trailer.
I put gray tank deodorizers in there but it doesn't seem to matter. Anytime I use a sink it pushes the stink out.
Is this usual? Maybe my tank vent is clogged or improperly installed?
I had similar issues. Replaced the Studor valve for the Bathroom sink. Fixed. No more smell. My Jayco 238 has two such valves, one under the sink, the other in the bathroom. It's hard to tell when one goes bad, other than the stink. Replacing the Studor valve did the trick
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Old 10-31-2023, 07:06 PM   #10
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Also know as an AAV - air admittance valve.

https://www.google.com/search?q=stud...hrome&ie=UTF-8
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Old 10-31-2023, 07:07 PM   #11
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It is a 2020 trailer but I suppose anything could happen with these.
Reach under the sink and tap it with a screwdriver handle and it may release.
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Old 11-01-2023, 09:25 AM   #12
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I had this happen to me. It wasn’t any valve just food and grease in the tank.

You have to treat your gray tank just like you do your black tank unless you never ever wash any grease or food particles down the sink. Old grease and food can stink pretty bad. I suspect this is the case for you. Fill tank, treat with a treatment, flush, repeat numerous times.
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