Tapping into 4" drain

**locus123** · 03-13-2012, 04:41 PM

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.

**Chad Schloss** · 03-13-2012, 04:44 PM

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.

**plumdum** · 03-13-2012, 07:06 PM

hey, goof. it's an easy fix if you know the right hillbilly.

**Gary Swart** · 03-13-2012, 08:15 PM

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.

**Terry** · 03-13-2012, 09:58 PM

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.

hj · 03-14-2012, 06:12 AM

There is a lot more to connecting a sink to a main drain line, than just "screwing the pipe to it".

**locus123** · 03-14-2012, 08:30 AM

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.