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New generation demand valve with quick-coupling for compressed air apparatus. Demand valve that responds to lung demand very quickly and comfortably and switches to overpressure automatically upon the first breath. Maintains a constant overpressure of 3.9 mbar in the full face mask to prevent inwards leakage. For use in combination with full face masks 3S-Maxx and Ultra Elite Maxx as well as with G1 Maxx.