Don't like leaving the first stage unpressurized. The inline shutoff is probably overkill, though. I'll concede that. There's an OPV on the Mk2. I did it because I didn't want to worry about unnoticed gas loss. But then slung under my arm, it's not like I'm going to miss the bubbles. But with only 19cf, I don't want to even sacrifice one accidental purge push.
That's my story, and I'm stickin' to it!
Easily carried spare supply for AOW deep dive instruction when I don't have a DM.
Unobtrusive spare for semi-solo photo work above 80' in case I'm completely distracted.
Haven't had to use it yet. At double my usual RMV, it gives me two minutes to problem-solve at 80' plus normal ascent and safety stop. But no - it's not an AL40. It's nothing but easily toted around.
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