New Bathroom Sink Drain Leaks At Threads

Tailpiece leaks the tailpiece attaches to threads on the bottom of the sink drain at its top end.

New bathroom sink drain leaks at threads.

I cannot get my bathroom sink drain to stop leaking specifically from the doomed rubber gasket area where the threaded tailpiece comes through. The leak is coming from the nut where the drain attaches to the bottom of the bowl so you tighten the gasket to the bottom of the bowl. You must seal the area between a sink s drain body and the actual sink surface otherwise water will leak out between the two and begin dripping under the sink. The bathroom sink drain leaks into the vanity.

The plumber at one of the big box stores told me that i couldn t use a pop up drain assembly with the holes for an overflow if my sink doesn t have an overflow. Tighten the gasket and nut under the sink. Apply plumber s tape to the threads of the drain union. Wrap a half inch thick putty ring around the the top of the drain flange.

It attaches to the p trap on its bottom end with slip nuts and washers. Turn the water to check for leaks. If no matter how tight the nut is and it still leaks take everything apart including the drain pipe and the drain outlet flange in the sink. Plastic slip washers used.

Remove any excess putty from around the drain. Sink drain popup leaks drip due to the threads of the lower half of the popup assembly making a channel allowing the water to drain out.