Saw someone else posting on how they needed plugs for an out of manufacture manifold, and I thought I would try.

I've got a set of doubles with an old Sherwood 300bar manifold on them. It's the older style, I can't remember what it's called - it's not a captured o-ring, it's a ______. The term is failing me now...

Anyway! Before I buy new left & right hand valves for the tanks for my sidemount setup, I thought I would try and see if anyone around here would happen to have any plugs for a manifold of that type laying around. I would be forever grateful to the seller!