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Thread: Back to back installations of toilets

  1. #1
    DIY Junior Member bishoptf's Avatar
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    Default Back to back installations of toilets

    I know this has been beat to death and I have asked before, but in the middle and discussing with my plumber which way we want to go. Toto calls out a double wye with 1/8 bends but I keep reading that in some cases it can cause s traps and the correct fitting would be a double fixture fitting. I know the preferred method would be to have each separately with vent but it's already a tight space I just can't get that to work.

    I am planning on putting in 2 Toto ultramax II's, and just trying to understand which fixture of those 2 is the better one to go with?

    Thanks.

    Last edited by Terry; 10-11-2013 at 10:08 AM.

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    DIY Senior Member Reach4's Avatar
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    I am suspecting those would be two terms for the same thing. http://www.terrylove.com/forums/show...t-installation

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    DIY Junior Member bishoptf's Avatar
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    Quote Originally Posted by Reach4 View Post
    I am suspecting those would be two terms for the same thing. http://www.terrylove.com/forums/show...t-installation
    Thanks Reach yeah I understand what Toto recommends but I have also read on this board and others that the wye 1/8 is possible that it could create a "s" trap and the double fixture, ala double combo etc ( NOT SANITARY TEE, that is what I am removing), is the one you should use. Not sure how much concern there is with the s trap when using the combination wye 1/8th.

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    Forum Admin, Expert Plumber Terry's Avatar
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    With quick flushing toilets, the double fixture cross can still skip over into the other arm.
    I know this for a fact.


    An S trap is not an issue with toilets. They are designed to siphon.
    After the flush, the refill tube replenishes water in the bowl.
    On the other hand, fixtures that should not siphon, such as lavs, shower and tubs, should not be S-trapped.


    Last edited by Terry; 10-11-2013 at 10:15 AM.

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    DIY Junior Member bishoptf's Avatar
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    Sweet, thanks terry, this only serves toilets, the other fixtures are coming in with different fixtures. I will go with the wye 1/8 bends.

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    DIY Senior Member Reach4's Avatar
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    It looks like my suspicion was wrong. This is from http://www.charlottepipe.com/Product...8A%20(409).pdf

    Name:  double_fixture.jpg
Views: 122
Size:  20.3 KB Edit... while I was editing the picture, Terry came through with the real deal.
    Last edited by Reach4; 10-11-2013 at 10:41 AM.

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