enter image description hereI just replaced the toilet, sink, and faucet in my bathroom and I now smell sewage from the sink. Everything is basically the same, although I had to get a drainpipe extender - still have p-trap though. Ideas?

Added pic but let me know if the angle is what you need and thank you!

Follow-up: since the sink and faucet I installed in the other bathroom don’t have this issue, ordered those exact products and going to reinstall to see if this remedies issue. Did not have to do the drainpipe extender on the other one and it was more exactly centered. Thanks for the thoughts and will update after I do that.

  • 4
    without picture we can not help you
    – Traveler
    Commented May 7, 2023 at 4:03
  • What Ruskes said. You're missing something here. A picture will make it far easier for us to help.
    – KMJ
    Commented May 7, 2023 at 7:12
  • Can you post some side view photos of drain pipe connection at wall? It's hard to see what's going on with the nuts there.
    – Armand
    Commented May 8, 2023 at 7:17
  • 1
    Agree with @ron Plus, the strainer/stopper in the sink can get mucked up and smell bad. Commented Jun 7, 2023 at 13:18
  • 1
    What is the black flying saucer above where the white and black pipes meet? That will not be the source of the smell but if it is an indication that you have not packed the various joints with appropriate washers (some slip, some flat, some integrated) THOSE could be your problem. Do an experiment: Remove all the trap parts, and cover the trap adapter coming out of the wall with a plug if you have one or freezer bag tied tightly to the pipe. If the small goes away, you know the trap is the problem.
    – jay613
    Commented Jun 7, 2023 at 13:45

2 Answers 2


Presumably (we can't see how without a picture, but we can tell what from the stench reported) you've screwed up the trap venting or turned the trap into an S-trap that siphons dry in your rework and adding an extender. Or you simply have a leak on the "drain" side of the trap permitting gas to pass.

That needs to be fixed, either by correcting the drain layout or adding a mechanical vent in an appropriate location (air admittance valve, often called "Studor" which is a brand name for one maker.)

  • Trap looks good. Except where it doesn't.
    – Mazura
    Commented Jun 10, 2023 at 23:46

I had a plumber look at this and he said my work was just fine and that I just added an unnecessary gasket but wasn’t an issue. So… still have smell and I’m thinking I maybe it was venting a little below the sink before and now that I have it so sealed up, it’s all coming out the top? Just can’t spend more mental cycles on this so thanks for the input!

  • 1
    This isn't an answer to the question. If you have no intention to pursue an answer, and since the rest of us can only guess and propose diagnostics, I recommend you delete the question. Also, I suggest that if you are short on mental cycles, breathing sewer gas will only make that worse. :) :) You should fix it.
    – jay613
    Commented Jun 8, 2023 at 17:38
  • Please use the edit link on your question to add additional information. The Post Answer button should be used only for complete answers to the question. - From Review
    – gnicko
    Commented Jun 8, 2023 at 19:51
  • I’m short on mental cycles because a plumber I paid told
    – KathyJ
    Commented Jun 9, 2023 at 23:02
  • Rather - Someone who's a bad excuse for a plumber took your money and didn't fix the problem.
    – Ecnerwal
    Commented Jun 10, 2023 at 23:50

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