Drum Unit Maintenance Kit for Pro 8110 8120 8100EX 8100S 8100EX 8110S 8120S D179-9510 D179-3581 D1793635 D1793653 D1793641 This maintenance kit is designed for use with specified Pro series models.It includes components necessary for drum unit upkeep to support consistent print performance.The kit contains replacement parts compatible with the listed device variants and part numbers.Installation follows standard procedures for the supported models.