Abstract: It has a fastening system (FIG. 1 ) of manual operation by a simple effort, being this system designed in order to disconnect the system in case of an internal increase of pressure occur protecting this way the rest of the system and the gas supply from this pressure increase. It also contains a retention valve (FIG. 2) to seal the steel container when disconnected. The relief valve (FIG. 3) placed inside the retention valve pin, purposes only to liberate the excess gas in order to have the pressure back to the standard safety level, being very important in case of accident and/or fire the relief valve pressure level is higher than the automatic disconnection pressure level in case the transmission system is in operation, this way first the fastening system is liberated and after the relief valve is liberated, but lower than the maximum test pressure of the steel container.