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Since this discussion seems to have moved partway into manifold discussion,
I'd like to get comments about an article by Woody Jasper in the NSS Student
Cave Diver Workbook (may be reprinted, I'm not sure). In it, Woody suggests:

	The objective seems to be a dual-outlet manifold with DIN connections
	including an outlet valve for each regulator and a bullet-proof
	crossover interconnection with a separate valve from each tank into
	the interconnection: conceptually, dual Y-valves with an equalizer
	hose. This crossover should only allow a slow air flow rate. It
	could be left open or opened periodically to equalize the tanks.

It seems to me that this is the way to go. A failure in your manifold no
longer means depleting your air supply, yet you still get the benefits of
a balanced air supply, less task loading, and less equipment (only on SPG)
for a normal dive. Has such a thing been made and, if not, why not? I have
considered putting together a similar system similar to the Y-valve (but
with DIN) solution he mentions above. Even just connecting them with a
hose that is left off during normal conditions would seem to be safer than
the independent tank method. And since it isn't usually on it wouldn't
need to be as "bullet-proof" as Woody suggests. But it would always be
there for emergencies.

Comments? Critiques?

Devon

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