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Bathroom sink waste outlet leaking

Posted: Tue Aug 19, 2008 7:00 pm
by Sagalout1954
Fitted new waste outlet to bathroom sink, (the sink has an internal overflow) the inside sink piece has rubber seal (and I've put a bit of extra sealant). Below sink piece has a rubber washer (one side flat and one side domed) and a large nut.

Doesn't seem to make a difference which way below sink washer is put on, seal is watertight. However, water is running down the thread (definitely - I can actually see it).

Have tried white 'plumbers tape' wrapped around the thread but makes no difference, water still forcing it's way out from there.

Any suggestions?