These printers use the 4409C001 cartridge:
Canon MAXIFY GX-3020
Canon MAXIFY GX-4020
Canon MAXIFY GX-5020
Canon MAXIFY GX-5520 X
Canon MAXIFY GX-5550
Canon MAXIFY GX-6021
Canon MAXIFY GX-6040
Canon MAXIFY GX-7020 X
Canon MAXIFY GX-7021
Canon MAXIFY GX-7040