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Thread: Leaking drain (pop-up) assembly

  1. #1
    DIY Member slb's Avatar
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    Default Leaking drain (pop-up) assembly

    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

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    Forum Admin, Expert Plumber Terry's Avatar
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    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.

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    DIY Member slb's Avatar
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    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. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    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 by Terry; 05-19-2006 at 04:18 PM.

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