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Thread: Still Confused About SanTee's and Wye's

  1. #1
    DIY Senior Member Briandl's Avatar
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    Default Still Confused About SanTee's and Wye's

    So I was told the previous installation of the drain for my water closet was incorrect because it used a SanTee on its back like so:



    So I found what I believe is a Wye among some other pieces I have sitting around and I'm trying to find the correct way to use it, would this work:



    Also, is there any reason I wouldn't be able to do it like this? Is it wrong to use a Long Sweep Wye (Name?) in this manner:



    The cleanout on the first would be harder to get to but seems like it would give more access inside the pipes.

    TIA

  2. #2
    Plumber jimbo's Avatar
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    It all has to do with the sweep and where the takeoff is with respect to the centerline, top, and bottom of the pipe. A sanitarty tee is appropriate for a horizontal waste branch entering a vertical pipe, and a wye is appropriate for a waste pipe entering vertically or horizontally into a horizontal line. If you look at interior cross sections of the fittings on a manufacturer's website like charlotte pipe or nibco, some of this makes more sense.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    IF you have the room, either one could be used, but are you sure you even need a cleanout at that location. The location of the vent would also impact HOW you install the toilet piping.

  4. #4
    DIY Senior Member Briandl's Avatar
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    Hey HJ, I sent you a PM with a quick question related to this thread.

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