Connecting to sanitary

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by JeffreyLB, Dec 27, 2012.

  1. JeffreyLB

    JeffreyLB New Member

    Messages:
    2
    Location:
    VA
    Can the 2" drain line from a shower tie into the side of a horizontal sanitary line or does it have to tie into the top?
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,303
    Location:
    Bothell, Washington
    The shower can tie into a horizontal waste line, but it needs to be vented before it does.
    Otherwise anything coming down the line can siphon the trap.

    If you have only a lav run with 2" pipe on that line, and that is vented, then it would be "wet vented".
    Most plumbers have those run in 1.5", so the waste to the lave would need to be pulled and upsized.
  3. JeffreyLB

    JeffreyLB New Member

    Messages:
    2
    Location:
    VA
    The shower drain line will be vented before connecting to the sanitary.
    Thanks
  4. Terry

    Terry Administrator Staff Member

    Messages:
    15,303
    Location:
    Bothell, Washington
    In that case, it's a wye fitting on the horizontal.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,058
    Location:
    Cave Creek, Arizona
    If your question is asked correctly, then you cannot use a sanitary tee in a horizontal line, period.
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