SCBA breathing apparatus: 1.Type: RHZK6.8/30 ,9/30,5 ... RHZK series self-contained open-circuit compressed air breathing apparatus are used widelyfor fire-fighing,chemical industry,shipping,laboratory ... "self-contained open-circuit compressed airbreathing apparatus for fire-fighting ,the breathing apparatus for shipping was authorized by the ... 6.8L carbon fiber SCBA Positive Pressure Breathing Apparatus