I've always been confused as to which way the cone-shaped plastic
washer should face when installing kitchen sink PVC tubing - there are
2 configurations - one is from nut + inside washer + thread and the
other is from nut + sliding washer on tube body + thread. Which way
should the tapered or pointed end face in either case? The first one
has a flange and the second one simply slides on the tube body. Do
they both face the same direction, and if so, which way, and if not,
which tapered end faces which way relative to the inside of the nut?
Thanks for a quick reply - the sink is leaking like crazy.

IB