Time moves on, and I didn't even realize Aquatica has new style extension rings! I've had ear problems, so haven't been diving in a few years, and I'm doing a little closet cleaning.
I have the following models for sale:
18456, 18463, 18453 (I think based on measurements), and 18457 (quantity of 2).
I only have three rear o-rings with the five rings, so a couple won't have the o-ring, sorry!
Make me an offer! Thanks for looking.