Automatic cut-off valve for use with propane or butane. Quick acting quarter turn shut-off. Must be placed in gas line between regulator and appliance. Detects loss of pressure or excess flow. Cuts off gas supply to appliance automatically and can be re-set manually. A cut-off valve of this type is mandatory on all British fishing vessels over 10 metres long using LPG. 3/8" BSP connections. Operating pressure 19 to 50 mbar. Low pressure trigger 8 - 14 mbar. Max flow rate 1.5 cubic metres per hour or 1.8 kg/hr.