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Thread: Tapping into 4" drain

  1. #1
    DIY Member locus123's Avatar
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    Default Tapping into 4" drain

    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. #2
    DIY Senior Member Chad Schloss's Avatar
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    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. #3
    Plumber plumdum's Avatar
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    hey, goof. it's an easy fix if you know the right hillbilly.

  4. #4
    In the Trades Gary Swart's Avatar
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    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. #5
    Forum Admin, Expert Plumber Terry's Avatar
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    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. #6
    Moderator & Master Plumber hj's Avatar
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    There is a lot more to connecting a sink to a main drain line, than just "screwing the pipe to it".
    Last edited by hj; 03-14-2012 at 06:15 AM.
    Licensed residential and commercial plumber

  7. #7
    DIY Member locus123's Avatar
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    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. #8
    Forum Admin, Expert Plumber Terry's Avatar
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    And you will need a vent on the sink.

  9. #9
    DIY Member locus123's Avatar
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    Thanks Terry - mixed up my horizontal and vertical stacks. Vent needed too....

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