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Thread: double sanitary tee in Canada

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  1. #1
    a/v technician segal46's Avatar
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    Default double sanitary tee in Canada

    Hi all,
    My question pertains to a double sanitary tee 2inch reduced to 1-1/2, i've been searching everywhere in Montreal, seems plumbers here dont like to use it as much as elswhere, though through shipement i will end up paying double for it, sic quebec is distinct for its own reasons...lol.
    How many plumbers use double sanitary tee's and if not why not, i will be using it for 2 sinks in different rooms, leading to a 2 inch drain.
    thanks

  2. #2
    Moderator & Master Plumber hj's Avatar
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    It, along with a double combination Y-1/8 bend, is ILLEGAL for that use in this, and most areas using the UPC. The IPC might allow it, but I am not sure about that. You are supposed to use the proper fitting, which is a "back to back fixture fitting", (R&G Sloane #91491 in ABS), which comes in 2x2x1 1/2x1 1/2, 2x1 1/2x1 1/2x1 1/2, and all sides 2", plus larger sizes.

    Double fixture cross
    Last edited by Terry; 06-19-2010 at 12:44 PM.

  3. #3
    In the Trades Wally Hays's Avatar
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    unfortunately ( if you are in the drain cleaning game ) IPC allows it
    Perception is 3/4 of reality

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    Moderator & Master Plumber hj's Avatar
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    As you can see, by the insert which was added to my posting, it appears similar to a double combo. However, the branches are attached higher up on the barrel to eliminate the creation of a 3/4 "S" trap, which would occur with a double combo. A sanitary cross is a "terrible" fitting to use in its place because while it is not impossible to snake the vertical line through one, by the time you succeeded you would have called it every name in the book that would have gotten your mouth washed out with soap when you were younger.

  5. #5
    In the Trades Wally Hays's Avatar
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    double san tees are probably the reason why they came up with the drop head for your snake
    Perception is 3/4 of reality

  6. #6
    Moderator & Master Plumber hj's Avatar
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    Even they do not always work. The spinning head will usually flip up and enter the opposite side.

  7. #7
    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    Quote Originally Posted by segal46 View Post
    Hi all,
    My question pertains to a double sanitary tee 2inch reduced to 1-1/2, i've been searching everywhere in Montreal, seems plumbers here dont like to use it as much as elswhere, though through shipement i will end up paying double for it, sic quebec is distinct for its own reasons...lol.
    How many plumbers use double sanitary tee's and if not why not, i will be using it for 2 sinks in different rooms, leading to a 2 inch drain.
    thanks
    Doubt San-T's are perfectly legal here in Canada according to the National Plumbing Code of Canada. In fact if you have two sinks sharing a common vent through a semetrically connected fitting then that fitting HAS to be a Double San-T. Because if it's not you're a creating an S-Trap and you are not allowed to install S-Traps. You also MUST install a cleanout below the Double San-T because every plumbing system needs to be designed so that each and every soil-or-waste pipe can be snaked from inside the house.

    You should be able to find yourself a 2x1.5x1.5" double san-T. If you can't then just buy a 2" double san-t and get three 2x1.5" bushings.

  8. #8
    DIY Member christoff's Avatar
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    would my setup work for a lav back to back with a laundry tub,with a cleanout underneath it ?
    Attached Images Attached Images  

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    Forum Admin, Expert Plumber Terry's Avatar
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    No. That makes S-Traps what will siphon.

    The vent needs to pull off of the top of the pipe, not six inches lower.

  10. #10
    DIY Member christoff's Avatar
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    Quote Originally Posted by Terry View Post
    No. That makes S-Traps what will siphon.

    The vent needs to pull off of the top of the pipe, not six inches lower.
    so, if i put the 90's on the top of the y's that would be ok cause it is lower?

  11. #11
    Forum Admin, Expert Plumber Terry's Avatar
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    You can't use a wye fitting for back to back fixtures.


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