I thought that too, but it doesn’t seem like that would cause water to seep into the piece at the very bottom that is also wet. I have a fresh paper bag underneath it and have sopped up any excess water, in case it was a fluke and perhaps water was already there from when he recently worked on it. If the bag stains this time I know I have a fresh leak. 🤷🏻‍♀️

Leaks can be tricky. I got called back to the same sink three times once myself. Dry everything throughly, turn on the water, and watch for leaks at the top joint. Often they leak and dribble, making it look like other fittings are leaking.

I would suspect that the sink itself is not flat and level where it needs to be. What brand is it and where was it sourced?

What is that gap on the left side of the gasket ( or seal ) near the top arrow? Is the sink itself not level and therefore the pipes attach on a slant?

Also, he left a big jagged hole in the wall.

I would want that hole patched in the wall. Good place for mice to come in.

I wiped everything off and it seems to be fine now, so maybe it was a fluke. Thank you for the help. I plan to seal up that hole once I run it for a week or so and make sure everything's fine with all of the piping. :)

That’s a very precarious installation you’ve got going there. If you were to drop your wedding ring or whatever down the drain, you wouldn’t be able to disassemble the P trap easily, nor would you be able to reassemble it without it leaking all over again. Does he consider that to be finished work?

One problem I see is he was trying to connect two dissimilar size pipes (the bottom leak). I solved this with the connector below. I found one at HomeDepot as a hanging card but here's the Amazon version.

https://www.amazon.com/LASCO-25-6860-Flexible-Rubber-P-Trap/dp/B00ITPGPAC/ref=sr_1_3

When he put in the new sink was a new drain (your top arrows) installed with plumber's putty? Here's a 2 min youtube to clarify. You should be able to see this from the top or perhaps a gasket which makes the seal.

https://www.youtube.com/watch?v=49a27LKG4kI

That ^ picture is pure hillbilly. The bend at the bottom of the trap is obviously kinked which is why most flexible fittings aren't allowed by code. You bring the pipes together without bending or kinking or funny angles.

The best way to check for plumbing leaks is to use a dry Kleenex. Run water down the drain & then wipe each joint w/ the Kleenex. Inspect the tissue for wet spots. You'll be able to detect tiny leaks, seepages that are difficult to see and impossible to feel.

I have one of hillbilly flex rubber drains under a bathroom sink. Been there for 10 years or more. I couldn't get the 'professional looking' drain to not leak. Repeated attempts. Got fed up with the fight & the contortions working in cramped space. I'm not proud of that plumbing job but it fixed the leaking first go plus it's easy to remove when I need to desludge the drain. I do inspect it fairly often because I don't trust it 100%.

That just looks too tight. I think those fittings are under stress because they had to be forced into position when they were hooked up and screwed together. If it were me, I would add an additional fitting so that the drain could jog sideways and then back. Maybe something along these lines:

It will take up more room, but at least it won't leak.

Found the leak. It is indeed located at the top-most gasket that lies directly beneath the ceramic bowl. I am going to call him back for a fourth time to fix it, because I have already paid a lot to have it done. 😒

This is the sink I purchased, from Wayfair: Caoimhe 24" Single Bathroom Vanity Set.

Ethel -

No offense but you need a new plumber by the looks of the work anyhow

For those chiming in...what is the -clamp, that is in middle of the tailpiece

It appears to be a saddle clamp for a reverse osmosis drain.

The sink quality and the lumber quality are match. Cheap and probably do not meet requirements.

Any decent plumber in itself would have installed a one piece dishwasher tailpiece and not use a saddle....still scratch my head working down or up as I look at the run....and the tailpiece, slipnut and then the ABS coming off the reducer off the trap. All sorts of what da ?

Ethel. going back to my 1st post in this thread. You need a new plumber. Not a handyman A plumber

One thing I was going to perhaps suggest. I had a new sink I put in and I thought the drain was "leaking." Kept having water along the whole stack like you under the drain. Almost went crazy. I discovered what was ACTUALLY happening is there was a leak around the gasket for the faucet handle holes on the countertop deck. Water was coming through the holes when people would get water on the countertop, run down the back of the sink, and then get on the drain pipe.

Just something to perhaps check.

I had one of those washers leak until I replaced it with a new one, the leaky one was just too hard to seal correctly.

Finding a good company can be quite difficult. They either charge a lot or don't do the job. After trying to clean the drain, I hired a professional. I talked to my wife about it, and she said we should go to a drain cleaning professional; they would advise on how to unclog a sewer line. With that said, it's a done deal. They will come to my house next week and hopefully fix the problem. I don't know what contributed to the clogged drain, probably my wife's hair.

"Finding a good company can be quite difficult. They either charge a lot or don't do the job."

Thanks for that @Austin Lawrence, I bet you will be back with a recommendation for a good company.................

millworkman-

So harsh. I can hardly wait to hear more from Austin after that profound insight... ;-)

Hey there! Sorry to hear about the ongoing sink troubles you've been facing. It's frustrating that the piping is still leaking even after three visits from the plumber. From the picture you shared, it looks like the seams might be causing the issue. It could be a case of improper connections or maybe even using the wrong materials. I'm just a newbie here, so I don't have much experience, but I think it would be a good idea to reach out to a professional plumber in New York for some help. They might have the expertise needed to tackle this situation. I found this website you could check out https://newyorkplumberdrain.com. They might provide more information and help. In the meantime, you could try using plumber's tape or a sealant as a temporary fix to prevent further leaks until you find a permanent solution. LMK how it was solved.