SCBA breathing apparatus: 1.Type: RHZK6.8/30 ,9/30,5/30,6/30 2.Air Cylinder: 6.8L,9L.5L.6L 3,.Carbon fiber ... or Steel SCBAThe RHZK series self-contained open-circuit compressed air breathing apparatus are used widelyfor fire-fighing,chemical industry,shipping,laboratory,mine ... *30*49 CCS,EC 5-6 6.8L carbon fiber SCBA Positive Pressure Breathing Apparatus