Liquid dispensing nozzle, characterised in that it comprises: - a liquid dispensing opening, - a removable cap intended to cover the opening when it is mounted on the nozzle, the cap comprising an outer casing and an inner casing that are coaxial, the outer casing and the inner casing each have a sealing surface, the casings are mounted so as to be able to move relative to each other in an axial direction of the nozzle between:. a configuration prior to first use, referred to as the storage configuration, in which the sealing surfaces are in hermetic contact with each other;. an unscrewing configuration of the cap when a pressing force applied to the cap is greater than a predetermined threshold, in which a rotation in a first direction of the outer casing drives by friction a rotation of the inner casing in the same first direction, so as to be able to unscrew the cap;. a safety configuration when a pressing force applied to the cap is weaker than the predetermined threshold or when no force is applied to the cap, in which the outer casing is configured to freewheel relative to the inner casing in the first direction, the safety configuration further corresponding to a configuration in which the respective sealing surfaces of the outer casing and the inner casing are separated from each other so as to allow air to pass between them. - a liquid dispensing opening, - a removable cap intended to cover the opening when it is mounted on the nozzle, the cap comprising an outer casing and an inner casing that are coaxial, the outer casing and the inner casing each have a sealing surface, the casings are mounted so as to be able to move relative to each other in an axial direction of the nozzle between:. a configuration prior to first use, referred to as the storage configuration, in which the sealing surfaces are in hermetic contact with each other;. an unscrewing configuration of the cap when a pressing force applied to the cap is greater than a predetermined threshold, in which a rotation in a first direction of the outer casing drives by friction a rotation of the inner casing in the same first direction, so as to be able to unscrew the cap;. a safety configuration when a pressing force applied to the cap is weaker than the predetermined threshold or when no force is applied to the cap, in which the outer casing is configured to freewheel relative to the inner casing in the first direction, the safety configuration further corresponding to a configuration in which the respective sealing surfaces of the outer casing and the inner casing are separated from each other so as to allow air to pass between them.. a configuration prior to first use, referred to as the storage configuration, in which the sealing surfaces are in hermetic contact with each other;. an unscrewing configuration of the cap when a pressing force applied to the cap is greater than a predetermined threshold, in which a rotation in a first direction of the outer casing drives by friction a rotation of the inner casing in the same first direction, so as to be able to unscrew the cap;. a safety configuration when a pressing force applied to the cap is weaker than the predetermined threshold or when no force is applied to the cap, in which the outer casing is configured to freewheel relative to the inner casing in the first direction, the safety configuration further corresponding to a configuration in which the respective sealing surfaces of the outer casing and the inner casing are separated from each other so as to allow air to pass between them.