Are you guys just using plain old CGA fittings I assume as a CGA-540 is a common size for the King Valve for commercial grade O2. Where might I locate the setup you guys are talking about that Cecil is using. I do a bit of work with all sorts of different fittings building our gas racks(for diving) and such for our company. If this was something besides a King Valve being left on issue, I may be able to help out some.
