part 20224 Backup Ring, Valve Plug Cat Pumps code 20224 Details Cat Pumps number20224 DescriptionBackup Ring, Valve Plug Qty per pump6 or 20224 Also comes in 34151 Valve kit, NBR (STD)76171 Valve kit, FFKM (.0770)76251 Valve kit, NBR (STD)76351 Valve kit, EPDM (.0220)76451 Valve kit, FFKM (.0770)76798 Valve kit, FPM (.0110)701798 Valve kit, FPM (.0110)701799 Valve kit, EPDM (.0220) Fits these pumps Cat Pumps 35 Frame 3 35013507HS3517HS Cat Pumps 38 Frame block-style 2 3801HS3811HS Cat Pumps 68 Frame block-style 3 680168116821