Here's the problem I'm having. I was clearing a clog in the wall coupler (not sure this is the right name for the part, I'm talking about the piece that goes from the p-trap to the cast iron nipple sticking out of the wall) underneath the kitchen sink in my rental unit. It does not look like the joint with the nipple was sealed and the threads are very corroded, so when I removed the wall coupler a small piece of the end of the nipple chipped off. This is what it looks like... you can see the chip along the top edge, it's about 1/4" deep.



Now when I reconnect everything, there's a small leak at the joint with the nipple. It doesn't seem like pipe joint compound would do much; currently thinking plumber's tape or epoxy, or a rubber coupler or something, but not sure if or which of any of those would do the trick.

Any advice on stopping the leak? Seems like the proper fix would be cutting the pipe and some new threads, then buying a slightly longer coupler and properly sealing the joint, but I don't want to do all that if there's a simpler (if jankier) fix. A trap adapter was suggested on another forum.

Thanks in advance.

 

It would be good if you could unscrew the nipple & replace it. If not the rubber coupling would be my next option. That thing looks like it's ready to clog.

 

Get yourself a little wire brush wheel that you can put on the end of a drill, and clean up those threads as best as you can. I'm pretty sure that the chip will not be a problem if you can just screw on your pvc thread adapter far enough. Use some TFE paste with teflon and you won't have a leak.

You will want to use an adapter like this.

You will also want to use a pipe wrench to tighten it, because hand tight isn't tight enough. But you don't have to put it on as tight as humanly possible... in fact you may break it if you put it on too tight. Reasonable tight is good enough.

 

Thanks for the quick replies. The wire brush attachment sounds like a good idea, I'd been skeptical about getting the threads clean enough to get an adapter screwed on past the chip but that might just work. If I can't get the adapter on I'll try the rubber coupler.

 

https://www.fernco.com/plumbing/resi...rap-connectors

If the threaded coupling doesn't make it this is the Fernco coupling that will!

 

The fernco coupler worked like a charm. Thanks y'all!