HP Pro X551DW CISS System Installation Video 2 of 3 https://www.youtube.com/embed/ox7pm6RJzpY Hold the cap still and unscrew the bottle. Fill the bottle with the ink indicated by the mark on the tube to the 500ml line. Clean up any ink spilled. Hold the cap and screw...

HP Pro X551DW CISS System Installation Video 1 of 3 https://www.youtube.com/embed/du7GTUq314E There are 4 ink cartridges for the X551 (C) for cyan, (M) for magenta, (Y) for yellow, and (K) for black. Also known as CMYK. Take note of the location of the Air Vents Port...