>> I dive with the isolator only open partially -- enough for full flow but little enough so i an raise my left hand behind my neck and just slide my palm against the isolator and shut it down.<< Interesting point. I've considered that myself, but I don't know enough about the 'insides' of the manifold. All I know is that it works a little different than the standard on/off tank valve. Are there any potential problems with this approach that one should be aware of? So as long as your pressure gauge goes down, everything's fine? (assuming that I'm breathing the long hose off the right post, and the pg is on the left post). michael, munich
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