I've just replaced the trap on a sink drain, and I can't get the replacement to stop leaking. The leak is coming from the where the trap connects to the wall stub (circled in the picture).
There is no washer here; it looks like this is supposed to be a pressure fit with the outside nut forcing the sides of the conical end on the bottom piece against the sides of the top piece. It's a great theory, but it doesn't seem to be working.
I've tried reeeeeeally tightening this joint, and while that seems to have reduced the leak it hasn't stopped it. Since this isn't really a screw joint, there's no point in something like plumbers tape.
Any thoughts on how I can stop this from leaking?