Kendall Raine
Contributor
Hand tight but not cranked. Too loose and the captured o ring can initially hold pressure but extrude later during the dive resulting in rapid loss of gas (autobiographical). Also, check after reg removal that the captured DIN o ring hasn't remained inside the valve. That can happen if there is a small about of residual pressure remaining when you unscrew the DIN fitting which pops the o ring out of its groove. Always carry spare o rings (either 111 or 112's depending on your first stage, 90 duro either way).
The delrin dust cap should be left on land/boat so as to remain clean and dry. I always put it on anytime the first stage is off the valve even if just changing tanks. I do not use the rubber/plastic cap that comes with Atomic/Scubapro regs. They don't screw down and are just dust caps, not water tight. Take them off.
The delrin dust cap should be left on land/boat so as to remain clean and dry. I always put it on anytime the first stage is off the valve even if just changing tanks. I do not use the rubber/plastic cap that comes with Atomic/Scubapro regs. They don't screw down and are just dust caps, not water tight. Take them off.