Sink Flange Smell

[Reach4]

So far about two weeks and no new smells from the p-trap since cleaning with bleach water, rinsing then vinegar/ water.

Only time will tell if it was long term bacteria / mold in the overflow area that I killed off or if after 6-12 months the ptrap starts stinking again. I will say that when I sniffed the overflow hole for the reservoir I never smelled that bad smell, but when I undid the p-trap it was DEFINITELY that smell.

Everything is as clean as possible for now all the way to the pipe in the wall. It could have been caused by enough gunk in the ptrap but there wasn't much. It's almost as if each use of the sink let in enough gas from the p-trap that it made it's way up the tailpiece. Still not 100% sure.

If you decide that is the deal, you may be able to switch from a 2 inch water seal on your trap to a 4 inch water. I think that is what happens when you reverse a reversable trap.

Did notice one sink's tailpiece is rusting a bit so that material isn't good for filing.

That is weird. Does that material attract a magnet?

 

[plumb-lines]

Thanks so much for posting this. I installed new Delta faucets and drains in 2 bathrooms. Odor showed up weeks after installation. I thought I was losing my mind as the traps/drains looked perfectly fine. Delta puts the overflow openings on the plastic tailpiece WAY too high, and water was trapped between the sink and tailpiece. I modified one trap/drain to try to correct the problem with no success, and I’m very happy to find that it’s a design problem, not a house plumbing problem.
I’m getting ready to replace the Delta drains with aftermarket metal drains, and hopefully resolve this stinky issue.