HP Printer Cartridges : How to Refill the HP Tri-Color Ink Cartridge
The plugs in the top of the HP tri-color ink cartridge can be pushed into the center of the cartridge without damaging the cartridge. Use a syringe to inject 12 milliliters of ink into an HP cartridge with help from an employee of an ink-filling station in this free video on HP printer cartridges...