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Thread: Double vanity, one gassy sink

  1. #1
    DIY Junior Member inexplorata's Avatar
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    Default Double vanity, one gassy sink

    I appear to be the victim of a previous owner's remodel.

    The right sink on a double vanity isn't vented correctly, I think. When I get my nose down in there it stinks, only when the water is running/has just run. The left sink, no problem.

    I'm fearful of what I'll find if I go through the wall; on the plus side, there's lots of room.

    I've been reading here what *should* be back there...Am I missing something obvious? Or is it just a case of tearing out sheetrock to see what's what?
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  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Default

    It could also be some gunk in the overflow tube of the lav basin.
    Try cleaning that first.

  3. #3
    DIY Junior Member inexplorata's Avatar
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    Thanks, I tried that. It seemed odd only one sink would burp gas?

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default overflow

    You tried WHAT? Why should it be strange for just one sink to do it if it is the overflow which your description indicates it is? If only one has a buildup, then only that one will give an odor.

  5. #5
    DIY Junior Member inexplorata's Avatar
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    Quote Originally Posted by hj View Post
    You tried WHAT? Why should it be strange for just one sink to do it if it is the overflow which your description indicates it is? If only one has a buildup, then only that one will give an odor.
    I tried cleaning out the overflow, sorry if I wasn't clear.

    Since only one sink stunk, that led me first to cleaning the overflow, as well as taking apart that trap to see what was built up there. Sadly, both are now clean-as-new, and the problem remains.

  6. #6
    Moderator & Master Plumber hj's Avatar
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    Default overflow

    HOW did you clean it? Unless you used a strong chemical to "burn" the debris out, it is still there. If the odor happens when you turn the faucet on, then it IS coming from the overflow.

  7. #7
    DIY Junior Member inexplorata's Avatar
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    Just posting to say you boys were absolutely right, I went more serious on the chemicals to clean the overflow again, and the smell has gone for good this time.

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