System for distributing a fluid product which is packaged in a tank

System for distributing a fluid product which is packaged in a tank, the system comprising a base and a cap which are intended to be mounted on the tank together forming a distribution chamber which has at least one supply passage for packaged product, the cap having a wall which is provided with a skirt for assembly on the tank and a sleeve which is arranged around a nozzle of the base forming between the sleeve and the nozzle a distribution interface which opens in a distribution hole formed in the wall, the system being characterised in that the wall is reversibly deformable by the pressure of the product in the distribution chamber from a stable closed state of the interface in which the sleeve is arranged in sealed contact around the nozzle towards a deformed opening state of the interface in which the sealed contact is broken in order to allow the distribution of the product contained in the distribution chamber through the distribution hole;

• wherein the skirt is connected to the sleeve via a deformable membrane and arms for connecting the skirt to the sleeve are arranged in the membrane.