Sealing drain tailpipe threads

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Deane, Nov 8, 2004.

  1. Deane

    Deane New Member

    Messages:
    2
    I've installed a few bathroom sink drains in my house (with overflow), and there's one thing I still can't figure out: how do you prevent water from seeping down the drain tailpipe's outer threads, underneath the rubber sealing washer that seals it to the sink bottom? I can't believe you're supposed to tighten the nut hard enough to mash the rubber washer fully into the threads. Or do I use teflon grease on the threads?

    Does anyone out there have a good technique for this?

    I checked under a few sinks at work, etc, and they all have the Crust of Ages on the threads at this joint. Surely I can do better.
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,903
    Location:
    Bothell, Washington
    I'm not supposed to tell you this, but a very small amount of plumbers putty mashed into the threads before you pull down the rubber washer will keep that water from running down past the inside of the rubber washer.:)
  3. Deane

    Deane New Member

    Messages:
    2
    Terry,

    Thanks! Your secret is safe with me. Great website, BTW. I bought two Toto Carlyles on the basis of your recommendation, and love them.

    Deane
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Darn, Terry! I thought I was the only one who knew this! I was going to write a book!
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,503
    Location:
    Cave Creek, Arizona
    leak

    In the book, you can also add that pipe joint compound on the threads and the bottom of the washer also work, and it does not seize the threads so it will not come apart some day like putty will.
  6. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Thanks hj. I usually do try to do things which will make it easier for " some guy " down the road, because sometimes I am the "some guy"! I think I will switch to dope on these drains.
  7. LonnythePlumber

    LonnythePlumber Plumber, Contractor, Attorney

    Messages:
    319
    Location:
    Wichita, Kansas
    Dope

    I also use dope and have not had problems sealing metal pop-ups to lavatories.
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