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Old 04-01-2018, 10:14 AM   #1
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Odor from kitchen sink cabinet on 3850

Last fall had odor coming from kitchen sink cabinet. Did not have full hookup. The odor went away after draining tanks. Is it possible the tank vents on top of unit were plugged?
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Old 04-01-2018, 10:48 AM   #2
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That might cause sewer gas to vent back through the p-trap into sink, but I can't see how it would vent in the cabinet space. Odd.
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Old 04-01-2018, 11:13 AM   #3
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Check under the sink for a vacuum breaker valve like photo below. They are notorious for sticking open allowing tank gases to escape. You can try tapping it, but usually best to replace it. Can be purchased ant some big box stores.
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Old 04-01-2018, 03:34 PM   #4
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Thanks guys for your help. Will check that vacuum valve. I can see how that would stick and allow gases to escape.
Thanks again!
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Old 04-02-2018, 01:49 AM   #5
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Check under the sink for a vacuum breaker valve...
And I learned something today! I was not aware of such a thing. Now I am! Thanks for your reply - seems like this is most likely the OP's problem.
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Old 04-02-2018, 07:22 AM   #6
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And I learned something today! I was not aware of such a thing. Now I am! Thanks for your reply - seems like this is most likely the OP's problem.
There's one under the bathroom sink too. I replaced both at the same time and solved that problem. Bought them at home depot
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Old 04-02-2018, 07:38 AM   #7
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It is called a air admittance valve, intended to let air in but not out. It is not unusual for one to malfunction. A temporary fix, until you can replace, is to cover with a plastic bag and seal with tape. That will stop odor but sink may drain slowly or pull the water out of the trap (and let odor in that way).
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Old 04-02-2018, 12:25 PM   #8
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If it has been sitting and water in the p-trap evaporates enough, smells and gases from grey tank could come up in the camper, especially when you turn on or have an vent fan on. Every so often go in and pour a half quart of water down each drain in shower, bath sink, kitchen sinks. This keeps the water seal in place. Unless you will be draining the grey tanks. I pour the grey tank treatment in so the tank smell is killed and also some of that stays in p-trap to keep that water from going sour as well.
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Old 04-02-2018, 07:39 PM   #9
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Or a rubber band

Quote:
Originally Posted by CedarCreekWoody View Post
It is called a air admittance valve, intended to let air in but not out. It is not unusual for one to malfunction. A temporary fix, until you can replace, is to cover with a plastic bag and seal with tape. That will stop odor but sink may drain slowly or pull the water out of the trap (and let odor in that way).
Or a plastic bag and a rubber band.

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Old 04-03-2018, 10:50 AM   #10
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Thanks guys for your help. Will check that vacuum valve. I can see how that would stick and allow gases to escape.
Thanks again!
I would try removing them and cleaning them before I would replace them !!!
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Old 08-10-2018, 06:22 PM   #11
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they are less than $5 at THD. I just replaced mine.
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Old 08-17-2018, 08:25 PM   #12
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Just exactly where is the valve ? It all looks like pipe which is the valve ?
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Old 08-17-2018, 08:39 PM   #13
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On the top of the black pipe on the right. It screws on.
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Old 08-17-2018, 10:40 PM   #14
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Got it thanks !
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