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Reset gear for use in Brother TN780 / TN750 / TN720 toner cartridges. This gear is only needed if you are refilling STARTER cartridges for the Brother DR 720, HL 5470, 5450, MFC 8950, 8710, DCP 8155, 8110, since the starter cartridges don't always have this reset gear installed. The printer displays a "toner life end" message if no reset gear is detected. A reset gear must be installed on any used TN780 / TN750 / TN720 starter cartridge in order for the printer to function properly once the cartridge has been refilled and re-installed in the printer.
*A starter cartridge is the cartridge that ships free with your printer. If you purchase the cartridge separatley, you will not require this gear.
Each kit contains: 1 reset gear + instructions for assembly (easy to do!)