The Canon MC-16 Maintenance Cartridge is a necessary component of the imagePROGRAF iPF600, iPF605, iPF610, iPF6000S, iPF6100, iPF6200, iPF6300, iPF6300S, iPF6350, & iPF6400 printers. It serves as the receptacle for waste ink during cleaning and normal startup subroutines, and is required for operation.