Hello!

We had a clog in the sink, so I took the parts apart, cleaned them, and resolved the clog.

But when I screwed the parts back together, a leak appeared. Water is dripping from underneath the part I screwed on:

Leaking sink pipe connection with hand-drawn red arrows and labels indicating "fixed" and "leak" areas under the bathroom sink.

I unscrewed and screwed it on several times to make sure it was threaded correctly, but the same problem occurred. Tightened it properly.

After a few attempts, it completely locked. I can't get it off again, with either hand or pliers. But on the other hand, it was never the problem; the water is coming out underneath it.

The question now is if I can seal around here:

Close-up of a white sink pipe connection with red arrows pointing at potential leak areas, indicating issues with sealing and tightening.

With this:

Sikasil C construction silicone tube held in hand, with an illustration of sealing around a washbasin displayed on the package. Yellow sealant tube with label "Suitable for wet rooms," indicating use for bathroom sealing.

It will indeed mean I won't be able to open it again, but as it stands now, I can't do that anyway.
 
C
P peter.linkan said:
The question now is whether I can seal around here:
It should be sealed without silicone, so something is wrong. Incorrectly installed, damaged, or missing gasket.
I think I see a rubber gasket there. Shouldn't it be on the other side?
 
I managed to get it up in the end.

What you see underneath is not a gasket but just a protruding edge.

The cause of the leak must be that there is no gasket. However, I don't understand why it didn't leak before. I haven't seen any gasket when I've opened it up.

I'll buy a gasket tomorrow and put it in, then it should work :)

A close-up of a white plastic pipe with a protruding edge, held in hand, missing a gasket, potentially causing a leak issue. A hand holding a white plumbing connection with a missing gasket, highlighting exposed inner edge and slight dirt, suggesting a leakage issue.
 
C
P peter.linkan said:
The cause of the leak must be that there isn't a gasket.
Yes, there must be a gasket, otherwise it won't be tight.
Logically, the gasket must be somewhere if it was tight before. It's not stuck on the sink side, or you got double gaskets on the other end, or it's lying in some corner on the floor?
 
If there was a stop, you might have had a bucket underneath when disassembling. The gasket might have ended up in it.
 
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