Those orings usually blow out when you haven't purged the air in the air line fully before you disconnect.
I'm not sure what your setup looks like or who's filling the tanks but always let the air purge fully, then disconnect the tank. It only takes an extra second.
If you have a more automated system, it will still happen from time to time since those systems tend to purge and disconnect at the same time. It leads to blown out orings here and there. I'd go with bigfootguy's idea if you have this system.
ETEK 3LT, with 14" Ti boomstick and cure 3 + bolt F/S
Vanguard creed eyes, membrane, bolt pin, detents, gaskets, schraders, orings and more F/s[/color]
Old school angel poppets/cup seals(LCD and A4/speed), spring detents(not sure which models) F/S