Kitchen Sink Drain Size

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by bobbyt, Jun 20, 2021.

  1. bobbyt

    bobbyt New Member

    Joined:
    Aug 16, 2009
    Location:
    Pennsylvania
    I'm sure this has been covered here but I'll be darned if I can find it.

    Every code reference I can find lists the fixture units for a kitchen sink with or without a DW and/or GD as 2, which would only require a 1-1/2" drain line. And yet, many here say that a 2" line is required. What am I missing?

    Thanks,
    Bob
     
  2. breplum

    breplum Member

    Joined:
    Oct 2, 2004
    Occupation:
    Plumbing and heating contractor
    Location:
    San Francisco Bay Area
    UPC says 2" for the drain, after the trap arm. maybe IPC is 1.5"*
    *UPC has a asterisk note item which states "Provide a 2" minimum drain" for kitchen sinks.
    2" is the way to go!
    All kitchen sinks require a cleanout, also.
     
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  4. Jeff H Young

    Jeff H Young In the Trades

    Joined:
    Feb 27, 2020
    Location:
    92346
    don't know penn. code 2 inch is my minimum on kitchen unless there is some challenge running 2 I wouldn't think of smaller except the trap and arm
     
  5. bobbyt

    bobbyt New Member

    Joined:
    Aug 16, 2009
    Location:
    Pennsylvania
    Thanks for the replies.

    So removing the trap arm and using the trap adapter doesn't qualify as a cleanout?
     
  6. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Our inspectors like to see a 2" cleanout for a kitchen sink.
    The trap can be 1.5"
     
  7. Jeff H Young

    Jeff H Young In the Trades

    Joined:
    Feb 27, 2020
    Location:
    92346
    again up to your code but generaly in my code removing the trap is not a cleanout in my world but could be in others
     
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