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In a message dated 2/22/99 7:25:43 PM Central Standard Time,
pallazzodelamore@ro*.co* writes:

<< 1.  Would someone please explain "upstream" regulator design?  What is
 this?  What manufacturers DO NOT use an upstream design? >>

An upstream valve is one in which the valve opens against the flow of air.  In
an upstream valve the uptsrem pressure tends to close the valve.  All diaphram
scuba regulators of which I am familiar, including the "pneumatically
balanced" ones contain inherently upstream valves.  Conversely, all piston
regulators of which I am familiar are of the downstream variety.
 
<<2.  Isolator valve on manifold:  Si or No ?>>

Of course!
 
 <<3.   Ocean diving, drysuit.  Double my alum 80's or my steel 72's
 (2650psi)?   >>

I'll leave this one for others.  My choice would be slightly larger steels.

Hope this helps.

Good diving,
Cpt. Dale Bennett
Captain Dale's Dive Center
Enterprise Marine Dive Charters
CaptnDale@ao*.co*
www.captaindales.com
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