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Thread: Double fixture fitting for toilets

  1. #1
    DIY Member Hazel's Avatar
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    Jan 2006
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    Default Double fixture fitting for toilets

    Is there a minimum length requirement (UPC) between a double fixture fitting and closet flanges used for back to back toilets. Another thread alluded to this. I need to use a 10" rough-in toilet on one side, which puts the length from centerline of toilet flange to centerline of DFF vent at about 12.5". The other toilet flange dimension is only about 14.5" as well.

    Is this wrong? Thanks,

    Hazel

    P.S. - I posted this on the toilet thread but urgently need the answer so sorry for the duplication.

  2. #2
    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    Default

    An interesting paper:

    http://www.pmmag.com/CDA/Archives/98...100000f932a8c0____

    illustrates why

    http://www.psdmagazine.com/pdf/Nov_Dec_04/48_60.pdf

    claims that "With the superior flushing of the 1.6-gpf water closet, the plumbing codes have prohibited the installation of a double sanitary tee or double fixture fitting for back-to-back water closets." They go on, and say that you can use a double combination wye and a 1/8 bend, or a double sanitary tee at least 30 inches from the centerline of the WC outlet. No explicit mention of the DFF, but it looks like the 30" rule mught apply there as well.

    Disclaimer: I don't have access to an honest-to-God Code book, but it probably doesn't matter. What matters is what your local authority wants.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    Default fitting

    I have never seen a prohibition to the standard back to back fixture fitting. A sanitary cross, however, is almost always never permitted. The double Y and street 1/8 bends would normally space the toilet openings too far from the wall.

    Last edited by Terry; 03-05-2014 at 11:56 AM.

  4. #4
    Plumber jaynote1's Avatar
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    Default

    good call, hj...i consulted my boss on this one, and his reply matched yours almost word for word...........

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