Abstract: A refilling cartridge is provided for refilling a jet printer cartridge with ink. The refilling cartridge includes a housing for a foil pouch refilling chamber and a hollow needle projecting from the housing. A rubber elastic sealing element is provided at a free end of the needle to be selectively penetrated by the needed. The sealing element is secured by a movable retaining element that shields the hollow needed and is movable in a lengthwise direction of the hollow needle to selectively expose the free end of the hollow needle. A spring element holds the retaining element in a position where the sealing element seals the open end of the needle and releasable locking elements are provided for the retaining element.