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Thread: Double Sanitee Vs Double Wye

  1. #1
    Network Engineer rmelo99's Avatar
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    Default Double Sanitee Vs Double Wye

    My sewer line exits through the sidewall of my basement about 3ft below grade and about 3ft above basement floor. I need to tie in two 4" drains from the floors above, one coming from left and one from right. (and leave a cleanout also). It appears that either of these double DWV fittings would/could do the job with some street elbows on either side.

    I'm in CT and we use IPC for our plumbing code. What will meet code for this application? If both are allowable, any advantage to one vs the other?


    Double Sanitee
    http://www.pexsupply.com/Spears-P428...e-Sanitary-Tee

    vs

    Double Wye
    http://www.pexsupply.com/Spears-P611...DWV-Double-Wye

  2. #2
    Moderator & Master Plumber hj's Avatar
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    A "double san tee", actually a "sanitary cross" is the same as a sanitary tee, it cannot be used in a horizontal drain line. As a practical matter, it is also a poor fitting in a vertical drain line also. EIther a double Y or a double combo has to be used for your application.
    Licensed residential and commercial plumber

  3. #3
    Network Engineer rmelo99's Avatar
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    If I wanted to use a combo on the way out so the back side is my cleanout and the top is where I tie in my drains, can I use a double elbow?

    http://www.pexsupply.com/Spears-P327...0-Double-Elbow

    or a Double Wye?

    http://www.pexsupply.com/Spears-P507...45-Elbow-Combo

    to drop into the top of the combo before exiting? I'm trying to keep the fittings from protruding out from the wall as much as possible.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    WE would need some diagram so we can tell HOW you intend to install the fitting and connect the other items to it. Right now we do not know if it will be horizontal or vertical, or where the other items are coming from to hook to it. A "double elbow" is a very poor drain fitting to use in most cases, although it works fine for vents.
    Licensed residential and commercial plumber

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