Rebuild Service Kit for Volvo Penta / OMC Pumps 3857794 , 3858847, 3851623 , 3851982 , 3855778 , 3851995. Includes: 1ea Impeller, 2ea Gaskets, 1ea Slinger O-ring, 3ea Cover Screws, 1ea Cam Screw, 1ea Seal, 2ea Bearings, 1ea Retaining Ring. Impeller Specifications: Width: 1-1/4" (31.5mm) Diameter: 2-1/4" (57mm) Shaft: 5/8" (16mm) Drive: 12 Spline Material: Neoprene Silhouette: 12 blades