Designed for Phaser 6600 and WorkCentre 6605 printers, this waste toner cartridge is an essential part of your Xerox machine. As each page passes through the print assembly of your printer, some toner fails to adhere to the page. Preventing damage to your printer, this waste toner is diverted to a special storage bin to be held. As this bin fills up over time, it's necessary to replace it at 30,000 page intervals to keep your printer in top condition.