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Summary: The HP 88 ink cartridges are all refilled in the same manner, by cutting the sticker off and removing the cap. Remove the rubber ball to get to the fill area of the HP 88 with help from an employee of an ink-filling station in this free video on HP printer cartridges.
"Hi, this is Taylor. Today we're going to discuss how to refill an HP 88 cartridge. The HP 88 cartridges are all refilled in the same manor. It doesn't matter if they're extra larges, black or any of the colors. To start refilling, simply cut along this top line here on both sides, cutting the, just the a sticker, and the cap simply pops off. Once you've removed the top, you can see the pump, the pump, the nozzle and then the fill area. To get into the fill area, you need to remove the rubber ball in this area. Do not use it, you will need to use it later. Once you have removed the ball, put it on the side. The next step in refilling the 88, is to inflate the inside bag. To do this, just get a syringe without a needle, stick in the side, and inject the air. Next step is to actually inject the cartridge with the ink. To fill the, the ink bladder, only insert the needle, just a, about an inch. Do not press too hard or you can pop the bag. Slowly inject the ink, filling the reservoir. It should take about twenty milliliters. Once you've filled the 88 with the ink, replace the rubber ball, press down firmly until you feel it click into place. Next thing, you need to make sure is that there is no air. If there is air, simply insert the needle and draw out the air. You can push the pump to create the pressure necessary for printing."
eHow Article: How to Refill an HP Ink Cartridge 88