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More (unsolicited) input from someone with zero cave experience, and a small
bit of time in the ocean: It makes sense to me that in a cave (or similar
environment) it's only the left post that could roll off. I'll also agree
that roll off followed by break off is the real hazard.

I've also found, however, that when descending on an anchor line (something
rarely found in caves....I think!) the line itself can slip between the right
post valve and the cylinder and roll off the right side as well. Granted,
break off would be nearly impossible in this situation, and anyone smart
enough to dive long hose on the right post would know within a few breaths
that they had been shutoff.

I guess this is just a bit more support for the practice of CHECKING your
valves ANYTIME they some near something that could roll them off.

Just my two-bits worth. I'll go back to lurking, reading, and learning
now....

-Case Harris
diveman@kw*.co*

Katherine V. Irvine wrote:

>  We all know that valves
> turn off clockwise, on counter. That means the reality is the left valve
> can roll off. We know that this is only half the problem. The other half
> is break off after roll off - the real risk. Therfore, you need a way
> out of that. This is done with the isolator and by putting the inflator
> ( WHICH IS YOUR THIRD REG ) on the right side which can roll on or break
> off, but not roll off.

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