2

I'm trying to replace a sink, including a new drain fitting. The existing p-trap seems to be 2" ABS, as pictured.

The 90-degree elbow that connects to the pipe leading into the wall is threaded, with a nut connecting to the p-trap. I have found a 2-inch ABS p-trap which appears to use the same threading, so I think I can unscrew the nut, leaving the elbow in place, and replace the rest of the system out to the new drain.

The problem is that the new drain has a standard 1-1/4" tailpipe, and the replacement p-trap ends in a 2" hub. I can't seem to find an adapter that goes into the 2" hub on one side and provides a 1-1/4" slip joint on the other side. I think the 2" side should be a "spigot" fitting, but nothing shows up on the usual home improvement stores for 2" spigot x 1-1/4" slip, or even 2" spigot x 1-1/2" slip (assuming I can find a reducer gasket).

(As you can see, the existing connection is a pretty rough bodge-job using some kind of mix of putty and adhesives, and I'd like to avoid repeating that mistake.)

complete drain

Improve this question

1 Answer 1

Reset to default
4

Drop the 2" to 1-1/2" at the wall with a reducer and stub and terminate with a trap adapter (all cemented, and ABS in your case). That's a more standard size for a sink, and most trap kits come with compression nuts and washers that will fit.

enter image description here

If you'd rather not add parts, you can get no-hub adapters to suit. I'd rather have hard parts, though.

enter image description here

Improve this answer
11
  • Just to be clear, in this case I would be cutting the 2" horizontal pipe, between the wall and the 90 degree elbow, then installing the white adapter in your first photo with solvent, correct? I actually have a bagged 1-1/2" full kit on hand but was trying to avoid having to cut anything to install it. If cutting is the best answer, though, I suppose I'll give it a try :D
    – James B
    Commented Apr 21, 2023 at 18:53
  • 3
    The trap kit is likely polyethylene, not PVC. That's fine. You can connect dissimilar materials with compression fittings.
    – isherwood
    Commented Apr 21, 2023 at 19:35
  • 2
    @JamesB I second the first suggestion. It's easy to do, and a benefit of using a polyethylene trap kit are 1) You get a free cleanout simply by unscrewing it, 2) you get two slip joints, on on the sink tail piece and the other on the arm after the trap. This gives you a ton of leeway in aligning the pieces without stressing the joints 3) they are CHEAP, if they get disgusting or leaky you can easily replace them with no tools. A 1-1/4" trap kit will fit the new tail piece and will include an adapting washer to fit the 1-1/2" trap adapter that you glue in.
    – jay613
    Commented Apr 21, 2023 at 20:21
  • 2
    No, that's fine. I just didn't expect you to have any trouble finding ABS. As long as the cement is appropriate, all good.
    – isherwood
    Commented Apr 22, 2023 at 0:10
  • 1
    My 1.5" trap adapter included a washer for securing a 1.5" tailpipe, plus a removeable "nested" washer that snaps together with the first one to fit 1.25" pipe.
    – James B
    Commented Apr 23, 2023 at 17:22

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.