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Set of 10 stainless steel exit port plugs make it easy to plug the exit ports on refillable cartridges that the printer punctured. If you run your cartridges completely out of inks, you will need to follow the video 7 from our support page to correct running the cartridge out of inks. These stainless steel exit ports are used to plug the bottom of the cartridges to allow you to put a suction on the cartridge to push inks back into the proper channel.