part 49103 Stem, Piston Cat Pumps code 49103 Details Cat Pumps number49103 DescriptionStem, Piston Qty per pump1 Also comes in 31556 Kit, Repair Fits these pumps Cat Pumps Plunger pumps 4 66DX30G1I66DX35G1I66DX40G1I66DX50G1I