OH BOY!!! .......RD
>
>
> That's dumb - "nearly the same O2 environment?" - come on, when was the
> last time the inside of your mask saw 3000 psi?
>
> The dangers of O2 increase with pressure and flow rates, which is why they
> are a concern in the tank, valve and HP side of the 1st stage, and not very
> much so anywhere else, least of all in a mask, mouth.
>
> --
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