KIT-E-DUPLEX ASSY

HP 5851-5861 Background Selector is a replacement part for the backside scan assembly in the document feeder. It is identified for this role by its exact HP part number, making it a service component for the scanner’s document-feeding system.

The listed compatible models include the HP Color LaserJet Enterprise Flow MFP M880z and HP LaserJet Enterprise Flow MFP M830z. The selector is intended for the backside scanning path, where the document feeder handles the reverse side of a sheet.