... , definitely not crack.B.ReducerHigh-powered reducing valve, air demand ≥500(L/min)Rapid aeration portMovable base, ... ≥300(L/min), automatically regulate according to actual air consumption.Small breathing resistance, stable airflowD.MaskSocket with mask ... minutes (30L/min while breathing )Total weight9Kg (exclude air)Related certificatePass China State Fire-fighting Equipment Quality Supervision ...