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>Rick Fincher wrote > >The other arrangement is essentially a pipe with yoke-type connectors on each >end, just like on the first stage of a regulator.. Each end of the pipe is >clamped onto two standard scuba tanks. A yoke fitting in the middle of the pipe >allows the regulator to be mounted. The standard valves on the tanks allow each >tank to be cut off separately but would not allow the continued use of the good >tank in the event that an O-ring blows on one. I used such a setup for deep dives ( 50-60m ) in the 70's. I never had a problem with it. However modern practice suggests that such a system is unreliable and I would tend to agree. I personally would not dive with such a system now. Currently I use 2 independent tanks with seperate regulators. This works well and allows me to use 2 different mixes on a given dive. However you then have to think carefully about what level of redundancy you have. For example if you exhaust 1 tank on the bottom and then you loose your deco mix you will not be a happy camper. I believe that the standard approach for such a system is to fill both tanks with bottom mix and then switch tanks at depth. Another consideration is either the OMS or Beauchat modular valve system. I don't know how easy it is to reconfigure in the field. It sounds like a potential source of problems to me. Barrie Kovish Vancouver, Canada bmk@ds*.bc*.ca*
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