Abstract: A head piece for a tank for liquefied gas to be mounted in a luggage compartment of a vehicle between an inlet conduit and an outlet conduit, comprising an over-pressure safety valve, a filling valve with a one-way protection, a delivery valve with a flow-limiter and a level meter, or some of these, which head piece is of block-shaped construction and equipped with a compartment communicating with the atmosphere, through which compartment any leakage gas is discharged.