Back to back installations of toilets

Discussion in 'Toilet Forum discussions' started by bishoptf, Oct 11, 2013.

  1. bishoptf

    bishoptf New Member

    Messages:
    23
    Location:
    missouri
    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.

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    Last edited by a moderator: Oct 11, 2013
  2. Reach4

    Reach4 Active Member

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  3. bishoptf

    bishoptf New Member

    Messages:
    23
    Location:
    missouri
    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.
  4. Terry

    Terry Administrator Staff Member

    Messages:
    14,806
    Location:
    Bothell, Washington
    With quick flushing toilets, the double fixture cross can still skip over into the other arm.
    I know this for a fact.
    [​IMG]

    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.


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    Last edited: Oct 11, 2013
  5. bishoptf

    bishoptf New Member

    Messages:
    23
    Location:
    missouri
    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. :)
  6. Reach4

    Reach4 Active Member

    Messages:
    1,936
    Location:
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    Last edited: Oct 11, 2013
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