Connecting a P-trap to a female drain connector in the wall

Question

I am replacing a bathroom vanity and while I'm doing that, I'm also replacing the p-trap for the sink (mostly because I want one with a drain, but also because I have to raise the height a couple inches) . Right now, there is a 1 1/4" female drain connector sticking out of the wall (which takes 1 1/4" I.D. pipe). The old P-trap was made of metal:

My intention was to use a standard 1 1/4" ABS P-trap, however, ABS is 1 1/4" O.D., and the drain connector takes 1 1/4" I.D. The edge of the connector is about 1/8" recessed from the drywall, which will make cutting that piece off and attaching a coupling fairly difficult, though may be possible. I don't want to actually open up the wall (as you can see, I'm already in the process of patching the messy hole someone made for this pipe).

Anyone have any better suggestions?

Answer 1

A 1 1/4" female FIP adapter worked perfectly. As soon as I saw it, I was embarassed for not having thought of it earlier.

I used some teflon tape, screwed the FIP adapter onto the adapter coming out of the wall, then just glued my 1 1/4" pipe directly into it. No reduction in pipe sizes, and 100% ABS parts.

Answer 2

I have made the mistake twice of demoing an old bathroom sink and throwing out the p-trap before the new sink and plumbing went in. Both times I regretted it because when I went to put in the new p-trap, I found some sort of strange/different plumbing setup which required several trips to the hardware store (and me repeating to myself "why did I throw out the old p-trap!?!?").

My recommendation is to use the old p-trap. Take some rags and steel wool and clean it inside and out and you should be able to get it looking like new. (And while you are at it use some rags to clean out the connector in the wall too since that looks pretty dirty too.) And then you can get a drain extension tube to raise the height up to your new sink fairly easily.

The only issue is that the distance from the wall of the old p-trap may not match your new sink. In that case try using part of the old p-trap to attach to the drain in the wall (since you do not have any extra pipe to work with) and then use a coupling to attach your new p-trap to this steel pipe. (Although not sure how easy it would be for you to find a coupling for you to attach to that steel pipe.)

Answer 3

Best way I've thought of so far is to use a drain tube extension coming out of the connector in the wall, then go into another female trap connector, then P-trap, and then finally female drain connector for the actual sink drain. Biggest downside is the pipe will get narrower between the wall and the p-trap, since it's 1 1/4" OD. On the upside, it'll be easy to take the p-trap off and clean it all out.