Hi, Can you please help me with my plumbing question? I had a leak with my plumbing underneath my bathroom sink because the metal p trap rotted at the bottom. So I replaced all the plumbing from the sink up to the metal J tube. I see a small leak where the plastic u tube meets the metal jamb nut (just above the nut) only when the sink is draining a full sink of water. What do I have to do to seal the metal to the PVC? I have a washer under the nut. I already tried tightening the metal nut with a channel lock wrench but it seems tight. Here is a pic
pic This pic show the plumbing is not fully assembled so the leak is not the obvious one in the picture! Thanks for your help!

 

I would cut a piece of that pipe & use a rubber coupling to join a PVC J to it but Lawrosa will have a better idea.

 

Why would you not just replace the whole trap assembly with PVC instead of leaving that one piece of poor condition brass and reusing the old nut? The whole set is about $5.00.

 

I agree with joecaption1.

However, any sink trap must be almost perfectly plumb (straight and inline). Hand tight of the slip nut should be good enough to prevent leaking. Using a wrench is not necessary and may damage the nut and washer.

 

Pulpo, I have the same configuration under my kitchen sink. It works ok. joecaption1, what do you mean? Do you suggest replacing the metal section to the wall? Does that involve removing the sheetrock? Please explain further.

 

Sometimes, you just can't replace 1/2 of the plumbing. That's why he's saying to remove the pipe that goes into the wall. It may be threaded & you won't have to touch the dry wall. That pipe is not in the best condition.

 

While not a permanent solution, Try the addition of a little plumbers putty above the washer on the j-tube connection. Is the washer a plastic one or a rubber one? If plastic, try a rubber one which will compress more as opposed to a plastic rigid one.

Personally, I would change it all out to a PVC trap, cut the copper pipe at the correct depth and connect with a Fernco coupler.