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Thread: Question about drain pipes

  1. #1

    Default Question about drain pipes

    Hi there - I'm trying to eliminate leaks under a reinstalled bathroom vanity. There's one slowly leaking joint, just inside the back wall of the vanity, where the PVC under the sink goes into black plastic that I assume is ABS. I have not taken this joint apart and I'm wondering whether it is likely a threaded joint or a glued one (or something else). It's the joint in the background of the attached photo. Should I try unscrewing the PVC pipe or is it more difficult than that?

    Thanks,

    Paul (homeowner)
    pcary@bw.edu
    Attached Images Attached Images  

  2. #2
    Plunger/TurdPuncher kingsotall's Avatar
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    Try to screw it on a little tighter. Righty tighty, lefty loosey. Your hand should be sufficient enough to give it the necessary tightness it needs.

  3. #3
    Illinois Licensed Plumber SewerRatz's Avatar
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    Quote Originally Posted by pcary@bw.edu View Post
    Hi there - I'm trying to eliminate leaks under a reinstalled bathroom vanity. There's one slowly leaking joint, just inside the back wall of the vanity, where the PVC under the sink goes into black plastic that I assume is ABS. I have not taken this joint apart and I'm wondering whether it is likely a threaded joint or a glued one (or something else). It's the joint in the background of the attached photo. Should I try unscrewing the PVC pipe or is it more difficult than that?

    Thanks,

    Paul (homeowner)
    pcary@bw.edu
    Sometimes people over tighten the plastic nuts and over crimp the plastic compression washer. When ever I get a call for leaks on sink drain pipes, I just take it all apart and replace each compression washer, and tighten each nut till they stop then a quarter turn. Also drain cleaners can ruin these plastic traps, they make so much heat that they get deformed just best to get a new P trap assembly and replace it.

  4. #4
    Master Plumber Redwood's Avatar
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    Why don't you take a picture from further back showing everything. Might have some good ideas for you on how to make this better.


  5. #5

    Default Question about drain pipes: more photos

    OK, thanks for the help. I'm attaching two more photos: one from further back that shows the whole drain system and another from the other side of the PVC to ABS joint. One other thing that doesn't work great is the "reducer" from the sink pipe to the next pipe down. The white pipe tends to slide off the black pipe (but only when I'm messing with it).

    Thanks,

    Paul
    Attached Images Attached Images   

  6. #6
    Illinois Licensed Plumber SewerRatz's Avatar
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    Can you post a picture of the black pipe and how it is attaching to the wall. Looks like someone may have over thought this project.

  7. #7
    Remodel Contractor GabeS's Avatar
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    More turns than necessary. They took the scenic route.

    I know you can't glue PVC to ABS. Not sure about threaded connections though.
    Gabe

    Don't follow my advice, I only know a thing or two about a thing or two.

  8. #8
    Forum Admin, Expert Plumber Terry's Avatar
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    All of those are slip joint fittings.
    It's easy to disassemble and to reassemble.

    Once you have it apart, you can check to see if the slip joint washers are in good shape. They should be round circles, not broken.

  9. #9
    Master Plumber Redwood's Avatar
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    I would have come straight out of the wall rather than use a 90 EL.

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