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Thread: Vertical drain drop from toilet

  1. #1

    Default Vertical drain drop from toilet

    I'm installing two back-to-back toto drake toilets and have been told by toto technical staff that they may not work properly with my 50 year old opposed cast iron tee. A double combination wye was suggested.

    Can I come directly from the closet flange to the wye with a 1/8th bend at the closet flange?

    I read in one place on-line, Plumber's Handbook, that even below a toilet, the max vertical drop is 24 inches, just like a sink trap.

    I know a 45 degree wye is not a vertical drop, but it is not a 90 degree, either. Is this code? Will I violate code, or have plumbing issues if I go straight to the 4 inch stack with the 45 combo wye?

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default toilets

    The first thing to understand is that if you use a Y and 1/8 bend, double Y and two eighth bends, or a double combination Y-1/8 bend, your toilet opening(s) is/are going to be a lot more than 12" from the wall. You need a double fixture fitting that is similar to a double combo, but narrower so it does set the toilets at the proper distance.


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