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The valve mentioned is the high pressure valve that feeds the regulator. All
masks are active and the tank is sized to run them all for the required
time. IMHO individual controls are not needed on an "emergency only" system,
just one more thing to do, break, forget, and carry.

Regards
Brent Regan

<Brent---"In an emergency put the mask on and turn the valve on "  Is
this valve with each mask, meaning that all lines are active , or is
this a master valve for all lines ?>

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