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Just how quickly *does* a manifold transfer gas from one side to the 
other?  I know it's not entirely unrestricted, but to accomodate a fill 
it's got to be faster than the rate which would be optimal for safety 
(which I suspect is half your rate of consumption under stress at max 
depth plus an ample fudge factor).

- Todd


>  I had a disk go in my shop at 4am on a brand new valve.   The tank completely
>  emptied in the roughly 40 seconds it took to jump out of bed and get
>  downstairs.  
>  [...]
>  With manifolded doubles you will be loosing gas from both cylinders if this
>  happens at a rate of about 1500 psi per 40 seconds.   Even if you get your
>  isolator shut down fast you will loose all the gas in one tank and a damn lot
>  in the other.   Solo overhead divers take note !
>  
>  This is not an excuse for using independents - it is a reason to get the hell
>  rid of the standard birst disk configuration from the start.   Cheep
>  insurance !
>  
>  Chuck

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