HP Q2439B Duplex Unit, R73-5047, RL1-0488, Fits 4250, 4350 Printers, WARRANTY!
HP Q2439B Duplex Unit, R73-5047, RL1-0488, Fits LaserJet 4250, 4350 Printer Series, WARRANTY! HP Q2439B Duplex Unit, R73-5047, RL1-0488, was designed specifically for the printer and will produce duplex prints.