HP 4700 CP4005 Duplexing Assembly - Mounts to Top of Printer. Replacement for RM1-1784-000CN Color LaserJet 4700 Printer Q7491A - Q7493AR Color Laser HP Color LaserJet 4700 Series and the HP Color LaserJet CP4005 Series printers.
HP RM1-1784-090CN Duplexing Assembly - Mounts to Top of Printer
Note: A non duplexing model will need RM1--1785 and RC1-5043 to make it a duplex. Please look at the HP 4700, HP CP4005 Duplexer kit which includes all three parts.