These printers use the PFI-303M cartridge:
Canon imagePROGRAF iPF 810
Canon imagePROGRAF iPF 810 Pro Wide Format
Canon imagePROGRAF iPF 810 Wide Format
Canon imagePROGRAF iPF 810 Pro
Canon imagePROGRAF iPF 815
Canon imagePROGRAF iPF 815 MFP
Canon imagePROGRAF iPF 815 MFP M40
Canon imagePROGRAF iPF 820
Canon imagePROGRAF iPF 820 Pro Wide Format
Canon imagePROGRAF iPF 820 Wide Format
Canon imagePROGRAF iPF 820 Pro
Canon imagePROGRAF iPF 825
Canon imagePROGRAF iPF 825 MFP
Canon imagePROGRAF iPF 825 MFP M40