Gas filling and distribution head which is equipped with a connection interface and tank including one such head

filling head and the distribution of gas to be arranged in the orifice of a container (1) pressurized gas storage, the head (2) comprising a portion (21) assembly to be received in the tank opening and a portion of housing a trigger device (22) of pre-expansion, the pre-regulating device (22) being arranged relative to the portion (21) for mounting to fit at least partially within the reservoir when the head is in the mounted position, characterized in that it comprises an interface (3) for connection adapted to cooperate removably with a filling control device and / or the gas withdrawal from the reservoir.