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

1 Answer 1


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

  • 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
    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
    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
    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
    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
    Apr 23, 2023 at 17:22

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