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Old 02-19-2018, 06:25 PM   #1
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Smell under bathroom sink

Bad oder under bathroom sink ..what do the black pipes do that are capped off but have two small slots in the cap?
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Old 02-19-2018, 06:28 PM   #2
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Air admittance valves or backflow preventers. Do you have tank washouts in your black and grey tanks?
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Old 02-19-2018, 06:31 PM   #3
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That would be your vent for the drain. It sounds like you need a new air admittance valve. They unscrew and you can pick one up at Lowe's or similar places. Here is a link to the one at Lowe's: https://www.lowes.com/pd/Studor-1-1-...e-Vent/1081741
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Old 02-19-2018, 06:34 PM   #4
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This ongoing thread may help answer your question.

Traced the black tank rinse line and found
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Old 02-19-2018, 06:36 PM   #5
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I call it a check vent, but it's purpose is to bring air in so the waste pipe drains properly.

As to the smell, do all your p-traps have water in them?

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Old 02-19-2018, 06:39 PM   #6
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Thanks...I will check that out..
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Old 02-19-2018, 06:41 PM   #7
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Not sure about that ..will look at those ..thanks
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Old 02-19-2018, 06:55 PM   #8
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Just in black tank...have had coach 5yrs. 99 Monaco executive...smell started 2 days ago in
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Old 02-19-2018, 10:27 PM   #9
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Unscrew the valve and rubber band a baggie or saran wrap over the end of the pipe. If smell goes away buy a new valve at Lowes.
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Old 02-19-2018, 11:07 PM   #10
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Quote:
Originally Posted by keymastr View Post
Unscrew the valve and rubber band a baggie or saran wrap over the end of the pipe. If smell goes away buy a new valve at Lowes.
We had this problem but under the kitchen sink. Was not pleasant until I figured it out.
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