The device has a sealing unit (14) occupying a liquid releasing position and a liquid blocking position, and immobilization units (60) for immobilizing the sealing unit in the blocking position and preventing the sealing unit from occupying the liquid releasing position. The immobilization units exert support on the sealing unit and are activated when a detachable cap (11) is mounted on the device, where the immobilization units are carried by the cap. An exterior cover covers the sealing unit, and the immobilization units are formed by a projection in the form of an annular groove (60).Le dispositif de distribution de liquide comporte un organe détanchéité (14) pouvant prendre une position de libération du liquide et une position de blocage du liquide. Le dispositif comporte en outre des moyens (60) dimmobilisation de lorgane détanchéité (14) dans sa position de blocage, configurés pour empêcher lorgane détanchéité de prendre sa position de libération de liquide.
