... coupling assy., stem, jack, wing nut, hex nut, which is used in the drilling sites for pulling the installed valve seats ... fluid end module. During the process of replacing the valves seat and maintaining the mud pumps, this tool will be more ... -PT, NATIONAL 7P50, 8P80,9P100,10P130, 12P160. This hydraulic valve seat puller was developed for two reasons: A. To eliminate damage ...