(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 7 of 7

Thread: trap tailpiece minimum length

  1. #1
    DIY Junior Member stevenrobertburke's Avatar
    Join Date
    Feb 2011
    Location
    Olympic Valley, CA
    Posts
    4

    Default trap tailpiece minimum length

    Hi,
    What is the minimum trap-to-vertical waste drop for a 2" tailpience?

    We are in a tight situation for two separate situations. one situation is a shower drain, the other is a laundry drain. Both are 2" ABS and will be located in a crawlspace.i

    Thank you, Steve

  2. #2
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    Location
    San Diego
    Posts
    9,001

    Default

    I don't think there is any minimum. You could have the trap arm parallel to and in contact with the base of the shower, sink, etc.

  3. #3
    DIY Junior Member stevenrobertburke's Avatar
    Join Date
    Feb 2011
    Location
    Olympic Valley, CA
    Posts
    4

    Default

    Thank you Jimbo,
    My intent is to avoid an "S trap" Is it ok to go from a 2" ABS trap to a 90 el (outlet is facting down) fitting into waste stack?

  4. #4
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Location
    Land of Cheese
    Posts
    3,151

    Default

    The limiting is the distance from the trap to the vent.

  5. #5
    Master Plumber-Gas Fitter shacko's Avatar
    Join Date
    Jan 2006
    Location
    Rosedale, Md
    Posts
    561

    Default

    Quote Originally Posted by stevenrobertburke View Post
    Thank you Jimbo,
    My intent is to avoid an "S trap" Is it ok to go from a 2" ABS trap to a 90 el (outlet is facting down) fitting into waste stack?
    If I read you correctly that IS a s-trap!

  6. #6
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,655

    Default

    quote; Is it ok to go from a 2" ABS trap to a 90 el (outlet is facting down) fitting into waste stack?

    That is the definition of an "S" trap, so you would be creating one, not avoiding it. And the way you describe it, there might also NOT be a vent for the drain.

  7. #7
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    Location
    San Diego
    Posts
    9,001

    Default

    Under the UPC the developed length ( weir of trap to vent opening) minimum length = 2 X diameter.So your length can be quite short, provided it does not drop without a vent opening

Similar Threads

  1. Tailpiece Trap Primer
    By dlarrivee in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 2
    Last Post: 01-14-2011, 02:51 PM
  2. Minimum trap arm length?
    By mtbonn in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 3
    Last Post: 04-19-2010, 07:45 AM
  3. P trap and tailpiece too close!
    By jdbangels in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 4
    Last Post: 02-09-2010, 04:50 PM
  4. Trap arm height, minimum tail piece length
    By davefoc in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 3
    Last Post: 11-18-2009, 09:20 AM
  5. Max length of a tailpiece?
    By jadnashua in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 8
    Last Post: 12-16-2004, 10:19 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •