... police dep.PICC insurance.Stucture:Full face mask,Damand valve,Pressure reducer,Warning whistle,Pressure Gauge,Back plate and ... back frame for high strength of nonmetal materials, level pressure reducing valve output terminal has received save mouth, use the time not ... 0.9MPa) Structure:mainly by whole vision mask, demand valve, pressure reducer,warning whistle,pressure gauge,back plate and carbon ...