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Thread: 3" Copper to PVC Coupling?

  1. #1

    Default 3" Copper to PVC Coupling?

    I'm a home owner moving a toilet 10 inches closer to a side wall (per my wife!) in an upstairs bathroom. This 2nd floor toilet drain pipe is 3" copper which i cut and now need to connect to 3 inch PVC or something. This 3" copper pipe runs/ran straight vertically from the toilet flange to the basement of the house in a 3-1/2" thick wall that runs between my downstairs kitchen and bathroom. I bought a rubber coupling that is supposed to connect copper to PVC but it is way too loose around the copper and, I discovered, the coupling doesn't fit in the wall so i can't just wrap the pipe with electrical tape (which I was tempted). Where I cut the copper pipe is at the top of the wall so the other end of this coupling is in my floor, above the wall, where i have more room. And yes for 10" the run for the toilet is going to be horizontal (I can't put a wye in the wall without moving electrical and my 10" floor joists don't give me enough room to put 3" 45 degree bends together). So, i need a 3" coupling that fits copper tightly on one end but then I need to make the 90 degree bend as close to where i cut the copper as possible. Ideally, If there is a rubber fitting/coupling that fit copper tightly and made a flex bend that would be the perfect hack (perfect because it would allow the forgiveness to allow everything to point downhill slighly) I also need to tie in a combination sink drain/vent pipe somewhere
    so instead of the pipe just going over 10 inches closer to the wall i'm going
    in then over then back then up... all within the height of the floor joists.
    Any ideas? Comments. I am having fun.
    Thanks, Jim

  2. #2
    I&C Engineer (mostly WWTP) Lakee911's Avatar
    Join Date
    Aug 2005
    Columbus, OH


    Will this Fernco work for you?


  3. #3
    Plumber Cass's Avatar
    Join Date
    Nov 2005


    You need what is called a Banded Coupling that specificly goes from copper to plastic.

    Some of the big box stores and most plumbing supply stores carry them.

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

    Default drain

    Your description doesn't give us a lot of information to work with. If that drain line dropped from the toilet directly to the basement without a vent, then that toilet should have "sucked" anything within 10' of it down the drain when you flushed the toilet. There may be many ways to accomplish your task, but using your description, we cannot tell you exactly how to do it.


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