Only Applicable Printer Model: for Canon imagePROGRAF TC-20 Printerfor Canon imagePROGRAF TC-20M Printerfor Canon imagePROGRAF TC-21 Printerfor Canon imagePROGRAF TC-21M Printer How to refill? 1--- Please find the ink bottle to replenish ink first, the color of the top cover of the ink bottle is consistent with that of the ink. 2---Please directly open the bottle cap and inject ink without squeezing the bottle by hand. It stops automatically when the ink is full.