Ink Cartridge Clamp Absorption Clip. Ink Cartridge Clamp Absorption Clip Pumping Tool for HP 21 22 27 28 56 57 60 61 74 75 92 93 94 96 100 121 122 INK cartridges. Ink Cartridge Clamp Absorption Clip Pumping Tool for HP 816/817/27/28/56/57/852/855 CANON 41/41. Sometimes printers funtion ok but can’t print some color or not smoothly. It’s most probably because of the air has leaked into the cartridges. In this case, use the clamp to pump out air. You’ll find the performance of the cartridges back to normal.