This is a kitchen sink.
The strainer usually has no threaded adapter, it uses a plastic washer
different than a desanco washer.
I have not seen a kitchen sink strainer that you thread the tailpiece into.
"djay" wrote in message
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Bcle.1251$m%3.224@trnddc02...
I thought I had the same problem at the compression joint. I was *wrong*
Turns out that the drop tube (connected to the drain with threads and then
you connect the p trap to it) has threads that screw into the drain
(threads on the top of this pipe). Those threads needed a turn of teflon
tape and the dripping went away. the leak was so subtle that I too
thought that the leak was coming from the ptrap fittings.