... , Reducer, air supply valve Produce name: Baoya Air Cart Breathing apparatusModel: RHZKF4×6.8/30CC RHZKF2×6.8/30CCFeatures: 1. Unique brake ... : * Constitution: Stainless steel trolley, carbon fiber cylinder, air supply pipe, Reducer, air supply valve and full face mask, etc.Configuration: 4 ... carbon fiber cylinder (4.7L, 6.8L or 9L-air cylinder) 1. Can be used by two persons simultaneously; ensure long ...