... valve,Pressure reducer,Warning whistle,Pressure Gauge,Back plate and cylinder. For field operation respiration. Has thermostablly, flame retardant, insulation ... good properties. Cylinders work pressure,30Mpa .back frame for high strength of nonmetal materials, level pressure reducing valve ... warning whistle,pressure gauge,back plate and carbon fiber cylinder. Wearing quality 10.2kg.Mask(ISI):Conform to ...