Looking for 3 1/4" o-rings for stiff rings so I don't have to use seals if I don't want to. (The seal flange is all that seals the suit-side stiff-ring.) I just got this ring system. It's pretty nifty, though I'm not sure if I "need" it. When I'm done playing, I'll post a revue of sorts. I know people are interested, so I'll do it pretty soon.