SAFETY MECHANISM: GasOFF is a safety system for propane cylinders that ensures 100% automatic shut-off in the event of a major gas leak. GasOFF is only compatible with pressure regulators whose outlet pressure is set to a maximum of 50 mbar. GAS LEAK TESTING: GasOFF can be used to check for major gas leaks. FILL LEVEL INDICATOR: The gauge displays the gas fill level (low to high). EASY TO USE: Easily mount GASOFF directly to the propane cylinder using a suitable wrench. Connect the low-pressure regulator (max. 50 mbar) to the GasOFF. Activate GasOFF by turning on the gas cylinder and pumping the pressure gauge 4-6 times.