>> Regs of different colors, shapes, manufactures, with poodle jackets 
>and/or color-coordinated hoses, and bottles stacked or on different 
>sides according to O2 percentage will only confuse the issue.  What you
>
>need to do is simple.  Look at your bottles.  Select the bottle marked 
>with the MOD corresponding to the stop you are at.  Turn the valve from
>
>that bottle on.  Put the reg from that bottle in your mouth.  If you
>can 
>breathe, you have the right gas.  
>
sounds good. how about a quick purge of the reg to see if its switched
on, rather than a breath? Could just the mouthful of 100% at 50m from a
switched off 2nd stage be enough for a problem, ie a potential spike
while you've no working reg in your gob?

Phil

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