Toto Drakes pulling water from each other's bowls

Discussion in 'Toilet Forum discussions' started by flushed, Jun 18, 2005.

  1. flushed

    flushed New Member

    Messages:
    2
    Location:
    Missouri
    We just installed two Toto Drakes that sit back to back in adjacent bathrooms. I'm experiencing the symptoms described on http://www.terrylove.com/wwwboard/messages2/42893.html

    That review was part of my rationale for not buying the American Standard.

    The flush does not pull all of the water from the nearby toilet's bowl, but enough that the next flush would appear to be "incomplete" at best. I have checked the rooftop vent for any clogs and have found none.

    Does anyone have any thoughts or suggestions?
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,052
    Location:
    Bothell, Washington
    I would think it to be the plumbing.

    I've seen plenty installed back to back without problems.
    In fact most homes plumb the toilets back to back.

    If you have a San Cross fitting, the water can skip across the fitting, pushing air and displacing water in the opposite bowl.

    Most high performance toilets require a fixture type fitting.

    [​IMG]
    Last edited: Feb 22, 2012
  3. srdenny

    srdenny Plumbing Contractor

    Messages:
    361
    Location:
    SF Peninsula
    Flushed
    I've experienced your situation. Contact Toto. They are aware of the problem. It occurs when the wcs are plumbed using a 3' figure #5 or doulbe fixture type fitting. They recommend a double combo setup. Unfortunately, a double combo with 2 90s might have a longer spred then the 30" to 32" common in back to back setups.
    Fortunately my problem was not over a slab. I was able to cap one side of the fig 5 and connect one of the wc's to the lavy riser, turning it into a wet vent. Lucky for me I ran it 2" rather than 1-1/2".
    Scott
  4. flushed

    flushed New Member

    Messages:
    2
    Location:
    Missouri
    Thanks for the advice. I think I'll try talking to Toto.
  5. srdenny

    srdenny Plumbing Contractor

    Messages:
    361
    Location:
    SF Peninsula
    Looks like you have the room to put in a double combo. Check with Toto first, but I think you can get out of this one with your pants still attached.
  6. Terry

    Terry Administrator Staff Member

    Messages:
    15,052
    Location:
    Bothell, Washington
    In Washington State they never would have allowed a sanitary cross for two toilets.

    They do allow a double combo
    [​IMG]
    A double fixture fitting
    Last edited: Jun 21, 2005
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