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Thread: Tub/Shower Combo Drain

  1. #1

    Default Tub/Shower Combo Drain

    I'm replacing my existing tub (with tiled walls for shower combo). The existing drain and trap are 1 1/2". Should I keep the 1 1/2" or replace both with 2" horizontal drain and trap?

    Thanks in advance for all the great help everyone has given me so far.

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default tub

    2" would be better because it is almost twice as large as 1 1/2", but how would you increase the size of the fitting where it connects to the main system? You cannot reduce back down to 1 1/2" at that point, the connection would have to be increased to 2" also.

  3. #3


    Right now the 1 1/2" drain connects with a wye to a 2" horizontal that goes into the main vertical stack. Sounds like i should just replace the old 1 1/2" with 2" into the 2" horizontal.

  4. #4
    Plumber Plumber2000's Avatar
    Join Date
    Jan 2005
    Eugene, Oregon


    Go with 2"
    Plumber for 20+years


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