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David Drake writes: --------------------------- Practice should make perfect when shutting down valves. You should be able to turn a failed regulartor off very fast. --------------------------- I think that the isolation manifold idea is excellent in theory, and if you dive with the cross-bar tap turned off, you are no worse off than independant doubles anyway (except for a small increased risk of cross-bar leaks). The problem is (as far as I can see) that it is virtually impossible to reach the taps behind your head. OK your buddy could do this for you, but what about self reliance and diving solo? I've heard various comments about going upside down to slide the set up your back, but I have never been able to get near my cylinder valves. It was mainly the shoulder straps of my BC which prevented me getting my arms up. The best solution I found for getting at the taps on back mounted tanks was to wear them upside down. I used rams-head 1st stage guards to take the weight whilst kitting up, and 2m 2nd stage hoses to put the regs over each shoulder. The only problem was that I had to mount the tanks high on my back in order to reach the taps, and this caused stability problems underwater. (It was great on the surface - head up atittude was easy). I would be interested to hear from anyone else who has tried upside down doubles, or who could advise me on ways of reaching my taps. Bill Dyer Nuneaton SAC (SAA #220) Warwickshire, UK. bill.dyer@mi*.co*.uk*
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