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   Nick , to answer your questions about what we use: I am the
only one who uses an isolator, the rest use the old Scuba Pro
"Benjamin" manifold. Lamar Enlish was the only other one who uses
DIN, but he had a bar, not an isolator. The others plug the burst 
disks, as a lost disk would mean lost gas. Actually, depending on
which side you lose, you can still lose all of you gas if you lose
a reg and the shutoff knob. I don't really care. If I break off the
knob (has happened twice) or lose a reg (never has happened to me)
I call the dive. I lost the maniflod once, but we had already 
walled the place out, and the tanks didn't finish draining until
after we were on the surface - that was rental gear in Mexico.
We use no scooter cages or protective devices - they are unnecessary.
The right knob turns off on the two side port manifold if you hit
the ceiling, but I just reach back and turn it on if I get near 
anythng - this is a reflex with me, and I also do it every time I
check my gas supply. I never run with any of my main regs turned 
off. On this note, I would avoid metal knobs - they dent and won't
turn either way. - George

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