Question About Clean Out Caps...

Discussion in 'Drain Cleaning' started by Mozart, Nov 29, 2010.

  1. Mozart

    Mozart New Member

    Messages:
    2
    Location:
    cHICAGO
    Hi guys, I'm new to this board & hope to learn some tips from reading the posts. I'm a real estate (small time) investor & contractor in Chicago. I'm not a plumber but I know how to do most basic plumbing stuff & find I'm doing more all the time. If I can't handle it I call my pro. Sometimes I run into things I don't understand & hoping I can get some help here

    OK, here's my problem...

    I'm cleaning out the pipes under a basement utility sink. I went to open the clean out in the stack & found the cap just nudged in tight enough to keep any water from leaking out. In other words, the cap has threads but the stack hole does not. There's no way to screw it in tight. I guess the last person working on it just smacked it with a hammer until it was tight enough not to leak. Obviously, I don't want to leave it like that

    I've never seen something like this. I figured all the female openings in a clean out would have threads. This one is totally smooth. I'm perplexed

    Is there a special type cap to use? By the way, it's all steel (or cast iron)

    Thanks in advance
  2. They make a twist-in expanding cap that will suffice in this situation. Old threads have a tendency to disappear/disintegrate over time.
  3. Mozart

    Mozart New Member

    Messages:
    2
    Location:
    cHICAGO
    Thanks for the reply

    Do they sell these caps at Home Depot type stores or do I need to go to a plumbing supply place?
  4. AssTyme

    AssTyme Plumber

    Messages:
    16
    Location:
    Wisconsin
    Most hardware stores, Home Depot, etc... will have them.
    Last edited: Dec 2, 2010
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,831
    Location:
    Cave Creek, Arizona
    Measure the inside of the opening. Yours may be 4". Most of those plugs are meant to fit inside a pipe, not a fitting, so you may not find one that will expand enough to seal your opening.
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