The WT-200CL waste toner unit is responsible for collecting any left over toner residue that is produced during the laser printing process ready for safe & effective disposal. The waste toner box is manufactured to exacting standards using high performance Brother components that are specifically designed to work reliably & consistently with Brother printers. This waste toner cartridge is the ideal solution for replacing your existing waste tank once it has reached its end of use. Your printer will not function to its full potential if you have a disfunctional or overused waste toner unit so its imperative that you invest in a high quality replacement waste cartridge to avoid printing errors, costly repairs & unwanted printer downtime. With an estimated capacity of 50, 000 pages the waste cartridge is long-lasting, reliable & easy to install.