Leaking drain (pop-up) assembly

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by slb, May 19, 2006.

  1. slb

    slb New Member

    Messages:
    48
    Location:
    San Francisco North Bay
    I installed a new drain/pop-up assembly in a new bathroom sink and I can't get it to stop leaking. It seems to be leaking between the Mack washer and threaded section of the pop-up body. I have tried tightening the locknut in half-turn increments to no avail. Is it possible that I have over tightened it causing a distortion of the Mack washer and the leak? I didn't have this problem the two previous times that I installed a similar assembly.

    -Steve
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,808
    Location:
    Bothell, Washington
    Drop the washer and nut down a bit, and push some plumbers putty into the threads. Just a little bit. You don't want any putty on the rubber washer, just in the threads.

    Without the putty, water will follow the threads down, past the rubber seal.
  3. slb

    slb New Member

    Messages:
    48
    Location:
    San Francisco North Bay
    Thanks Terry!
    I read the instructions, and they do say something about putting plumber's putty on the threads, but they are not very clear. I thought they were referring to the threads where the tail-piece attaches, not the threads under the washer.

    Regards,
    Steve
  4. Terry

    Terry Administrator Staff Member

    Messages:
    14,808
    Location:
    Bothell, Washington
    I don't think what I posted will be found on any instructions.
    You asked why it leaked, and it's a common question.

    It's the answer that any plumber that installs faucets would be able to tell you.

    I have no idea why the people that write the instructions, never have to install the things and run water through them.
    To us plumbers, it's a no brainer.
    At least after we've fixed a few that way.
    Last edited: May 19, 2006
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