Tapping into 4" drain

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by locus123, Mar 13, 2012.

  1. locus123

    locus123 New Member

    Messages:
    31
    Location:
    Ontario
    Is there any kind of special fitting out there for literally tapping into a 4" drain? It's ABS, running in a side wall in the basement, almost completely surrounded by spray foam - there is about 1/3 of the pipe still visible on the top. It runs horizontal on the wall for about 15' right past where I'd like to put a sink. I'd almost need some kind of screw in fitting and I don't think they exist.

    I know it's possible to carve out all the spray foam, but i was hoping there woudl be a simpler solution. I'm sure some hillbilly out there has drilled a hole in a drain pipe and jammed a 1.5" drain in it before. :)
  2. Chad Schloss

    Chad Schloss Member

    Messages:
    329
    Location:
    USA
    yep, i'm sure they have, and then come looking here for answers on how to repair it the correct way. it's only foam. cut around it, insert the proper fitting.
  3. plumdum

    plumdum Plumber

    Messages:
    9
    Location:
    Louisiana
    hey, goof. it's an easy fix if you know the right hillbilly.
  4. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,329
    Location:
    Yakima WA
    Probably the simplest way to make this connection is to clear a bit of the foam away, then cut a piece out of the pipe. Use a no-hub connector on one side of the cut and a regular coupler on the other. In between a couple of short pieces of pipe and a tee. You can't just tap in as you hoped.
  5. Terry

    Terry Administrator Staff Member

    Messages:
    14,893
    Location:
    Bothell, Washington
    More then likely, you will need a 2" line, and a fitting with a 45 angle on it.
    You can't just drop waste into the line and expect it to go anywhere.
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,491
    Location:
    Cave Creek, Arizona
    There is a lot more to connecting a sink to a main drain line, than just "screwing the pipe to it".
    Last edited: Mar 14, 2012
  7. locus123

    locus123 New Member

    Messages:
    31
    Location:
    Ontario
    Thanks guys, I figured as much - I'll start digging. It shouldn't need a vent as the sink will be about 3' away from the drain.

    To be honest I expected more backlash than that. :)
  8. Terry

    Terry Administrator Staff Member

    Messages:
    14,893
    Location:
    Bothell, Washington
    And you will need a vent on the sink.
  9. locus123

    locus123 New Member

    Messages:
    31
    Location:
    Ontario
    Thanks Terry - mixed up my horizontal and vertical stacks. Vent needed too....
Similar Threads: Tapping drain
Forum Title Date
Plumbing Forum, Professional & DIY Advice, Tips & tapping into buried 2" drain line Jan 11, 2013
Plumbing Forum, Professional & DIY Advice, Tips & drain tapping noise Mar 18, 2012
Plumbing Forum, Professional & DIY Advice, Tips & tapping into existing drain for new sink Jan 30, 2005
Plumbing Forum, Professional & DIY Advice, Tips & Tapping into PEX in crawl space - questions about freezing Jul 3, 2014
Plumbing Forum, Professional & DIY Advice, Tips & Ticking/tapping noise PEX baseboard lines Mar 14, 2014

Share This Page