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Tom,
Everything is PCV except for the brass ring that tightens down to the seal. You are probably right about the neoprene ring binding on the install. From below it looks like the ring is...

Speedball,
Thanks for the earlier advice.

I made the cut and was going to include a picture from underneath, but the jpeg file size is too large (200K) to upload. In any case it was probably a...

My house is about 2 years old and the original owner had an extra upstairs bathroom installled by a plumber rather than the builder. The shower is used infrequently and I noticed a leak on the first...