If the inner cylinder is of this style, the safe exhaust method, or nondestructive exhaust, can be used. There is no need to unplug the internal ink cartridge and use any tools such as syringe, so it will not affect any part of the printer and will not destroy the sealing performance of continuous supply. Send you a schematic diagram of continuous supply, 3 operation diagrams and explanatory text. It is easy to operate by comparing the pictures with the explanatory text.