The WB-P05 (part number A4Y5WY1) is a genuine Konica-Minolta waste-toner bottle designed for use in select Bizhub colour laser multifunction printers. It captures excess toner particles generated during the printing process, preventing their accumulation inside the device and maintaining print-engine cleanliness. According to manufacturers and suppliers, the container is designed to support an estimated yield of about 30,000 pages at 5 % coverage. 
It is user-installable (a customer-replaceable unit), and fits models such as the Bizhub C3350, C3351, C3850, C3850FS, and C3851FS.