HP LaserJet 4240, 4250, 4350 maintenance kit - 120VAC - Includes fusing assembly, separation roller, transfer roller, feed roller for Tray 1, two feed rollers for 500 sheet tray. 225,000 pages. Alternate numbers Q5421A, Q5421-67903 - If ordering for T or TN models you should also order 1 each RM1-0036 and 2 each RM1-0037. Third Party Rollers. REQUIRES THE RETURN OF THE DEFECTIVE FUSER.