SCBA breathing apparatus: 1.Type: RHZK6.8/30 ,9/30,5/30,6/ ... Steel SCBAThe RHZK series self-contained open-circuit compressed air breathing apparatus are used widelyfor fire-fighing,chemical industry,shipping,laboratory,mine ... equipment,and it is up to the China standard of GA124"self-contained open-circuit compressed airbreathing apparatus for fire-fighting ,the breathing apparatus ...