... apparatus With 6.8L carbon fibre cylinder Silicone Full Face mask Weigth:13KG Marine fireman's Breathing apparatus equipment RHZKF ... , the residual gas alarm emitted a continuous 90dB sound. Full face mask --- Comprehensive cover is a monocular side windows, big vision, ... transparency is good, double-ring sealed, positive pressure type mask film, the main body is made from silicone rubber. Back ...