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Thread: Tapping into main stack cleanout

  1. #1

    Default Tapping into main stack cleanout

    I am putting a wet bar in my basement and I was wondering if it's OK to tap into the 4" cleanout in the main waste stack in the basement. There is a 4" cap (threaded) on the cleanout -- can I remove the cap and run a threaded 4" pipe (on one end) out of it and reduce it down to 1.5" for the wet bar drain? I'll vent the wet bar appropriately.

    If I can - do I need to provide another cleanout in it's place?


  2. #2
    Plumber plumber1's Avatar
    Join Date
    Aug 2005


    You can't reduce the size of the clean out.

  3. #3


    But could I put in a 4 x 1 1/2 tee and add a 4" cleanout above it? Then use the 1 1/2 tee for my fixture drain?

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default tee

    Practically, yes. Legally, and properly, No. You at least need a proper vent to do it legally, and the fitting you would need is so specailized that very few plumbing wholesalers would even have it.

  5. #5


    so it sounds like my best option is to just cut in a new tee in the main stack below the cleanout? Since the stack is PVC, that's not a terribly big deal.


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