In regards to your question of full face masks and solutions to mix
switching problems, there is a new valve (redundant supply valve) on the
market. Ffm's require the use of a regulator and the redundant supply
valve (rsv)  connects to the second stage (where the lp hose goes). Two
lp hoses (from two different tanks) are connected to the rsv. To switch
gas, slide the valve up or down. 

I saw a proto type of this valve. Very simple. One moving part (valve
with 4 o rings) and field servicable. On the cover of the current issue
of the Dive Journal is an excellent picture of this valve connected to a
ffm. 

The valve is made by Sartek Industries, Inc. (516) 924-0441, e-mail:
sardind@id*.ne*


Les Glick

p.s. If anybody is interested, I am not connected to Sartek industries,
but I do write for the Dive Journal.

>----------
>From: 	William M. Smithers[SMTP:will@tr*.co*]
>Sent: 	Monday, May 26, 1997 12:20 AM
>To: 	techdiver@aquanaut.com
>Subject: 	Gear Selection...
>
>
>This is my first post to the techdiver list (so please keep the
>blowtorch at idle!)
>
>I need to refit my deep diving gear (including Nitrox and trimix), 
>and would be greatly appreciative of any input you guys might have.  
>I'm looking to have a setup that will still be current for a couple of 
>years to come.
>
>* Reg(s): I'm currently using the US Divers Micra, which, aside
>  from the annoyingly short hose, has performed well on deep 
>  dives so far (upside down at 300 fsw, etc.).  I'm assuming I'll
>  go with Scubapro.  G500, G250, or D400?  I've heard that 
>  the D400 has (water) leakage problems in extreme conditions - is
>  this rumor true?  MK20 or the new MK20 ultralight?
>
>* Computer: I'm embarrassed to admit it, but I got burned on the
>  Beuchat Maestro Pro Enriched Air (aka Cochran), and definitely don't want
>  a repeat of *that* fiasco (DOA at 260 fsw, etc. - although it
>  made a possibly record-breaking 57 dives before flaking).  My
>  backup computer is the non-air-integrated Parkway, which has
>  performed flawlessly. Is the Aladdin still the way to go for 
>  Nitrox air integrated computers?  I haven't looked in a couple
>  of years...are there any computers now available for non-nitrogen
>  diluent mixed gasses?
>
>* Full face masks: I'd like to go full face for safety reasons, but
>  have there been any recent solutions to the mix-switching problem?
>
>Thanks,
>
>-Will
>--
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