Why Can't A Double Sanitary Tee Be Used Here

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Hammerlane, Dec 1, 2012.

  1. Hammerlane

    Hammerlane New Member

    Messages:
    252
    Location:
    Ohio
    Why can't a double sanitary tee(DST) be used here instead of the double fixture tee(double fixture fitting)? Does it have to do with in case the line needs to be snaked? The snake most likely would have a tough time going down once it reached the DST?

    What is a situation where a double sanitary tee can be used?

    Attached Files:

  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,805
    Location:
    Bothell, Washington
    A double sanitary tee can be used for a vent fitting.

    If you snake a double santee, the snake goes right across and toward the other p-trap.
    I knew a guy that pushed his snake right through an aging brass p-trap in the next condo unit.
  3. Hammerlane

    Hammerlane New Member

    Messages:
    252
    Location:
    Ohio
    Makes sense. Thanks.

    That guy wouldn't of happen to be Terry would it??:D
  4. Terry

    Terry Administrator Staff Member

    Messages:
    14,805
    Location:
    Bothell, Washington
    No......I heard that one at a high school reunion. A guy that became a dentist was doing handyman work while in college. He said he was pushing real hard on the snake and was quite happy he was able to push it through until he found out what he had done.
  5. big2bird

    big2bird IBEW Electrician

    Messages:
    141
    Location:
    Anaheim, Ca.
    That's funny as h*** right there.
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,304
    Location:
    Cave Creek, Arizona
    A sanitary cross creates "crossover" of waste is "almost" impossible to snake through it. A double "combo" creates "3/4 S" traps, so the double fixture fitting is the only proper one. A "'double sanitary tee" is not necessarily a "sanitary cross". There are double sanitary tees with the two inlets one above the other and others with them a 90 degree apart.

    My first boss told me about a job where he was using a flat steel tape through a closet bend. He hit an obstruction right after pushing it in, so he "pounded" it a couple of times and it continued to go in. It was a short time after that the tenant next door was pounding on the door because he had "something" coming out of his bathroom and snaking across the dining room floor. One time, I was snaking a supermarket drain from the back of the building. I had about 140' of snake in the drain, which should have put me at the front of the building, so I went outside to open the front 2 way cleanout to see if I was there yet. But when I got there, my snake had turned up from the combo, pushed the cleanout cover off and was going across the sidewalk. Some "dimestore cowboy" had "wrestled" it the ground and hogtied it around a post.
    Last edited: Dec 2, 2012
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