... called “Valve Seat Puller” is a service tool, consisting of hydraulic pump assy., pressure gauge, puller head, hose coupling assy., ... NATIONAL 7P50, 8P80,9P100,10P130, 12P160. This hydraulic valve seat puller was developed for two reasons: A. To eliminate damage to ... , puller assembly, and pump are equipped with quick disconnect couplings for easy handling. The pump comes complete with a pressure gauge ...