*Prevent unauthorized operation of the main gas cylinder valve.
*Needless to require that the various diameters and threads of the lock and the gas cylinder cover completely match with each other
*Suitable for neck rings with a diameter of 8.9cm at the max.
*Installation can be finished in a few seconds,the LOTO procedure can be finished easily and quickly
*Suitable for 0.8cm - 4.5cm valves.