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>snip 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. >snip I have been using doubles/Twins with an isolation manifold for only a short period of time. I am using Wings which means the prescribed system of sliding the wings up works very well and I can reach the valves. This is even effective with a compressed neoprene drysuit which limits movement. Part of cave diving ethos and teaching (esp US) is that you must be able to reach your valves. Perhaps the BC is the limiting factor. Andy Kerslake BSAC IANTD NSS-CD Internet andy-kerslake@re*.co* X400 S=Kerslake G=Andy C=US ADMD=TELEMAIL PRMD=RETIX O=UK
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