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An ink cartridge that self seals its outlet opening with an outlet valve that connects to an inlet on the printhead. The outlet valve has a radially extending flange fixed within the outlet opening and an annular skirt of resilient material extending from the side of the outlet opening to the valve seat. The annular skirt is biased into sealing engagement with the radially extending flange to close the outlet valve until installment when the printhead inlet lifts the annular skirt off the flange so that ink flows around the flange into the printhead.
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