Starter BROTHER TN-720, TN-750, TN-780, TN-3310, TN-3330, TN-3340, TN-3360, TN-3380, and TN-3390 cartridges require that a flag gear be installed to function after being refilled.
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If the cartridge that you are trying to refill was the original cartridge shipped with your printer, you will need to purchase this product because such a cartridge will not already have a flag gear installed.
Each Flag Gear Kit contains the following:
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