Jabsco 17370-0001-P Impeller replaces Cummins 3008503This Jabsco impeller is constructed from durable neoprene for a long working life. This water pump impeller comes with lubricant, a gasket and instructions for easy installation. Replaces: DDA; 8927570; Cummins; 3008503; CAT; 3N-4859; Specifications: Diameter: 3-3/4"; Width: 3-1/2"; Shaft Diameter: 1"; Drive Type: Double Flat; Material: Neoprene; Blades: 12; Jabsco 17370-0001-P Impeller Installation Instructions Remove screws, endcover, and gasket; Remove old impeller using Jabsco removal tool; Remove any debris from pump chamber; Lubricate inside pump wall and grease; Insert replacement impeller into impeller bore with a twisting motion; Fit replacement gasket and endcover; Tighten endcover;