Features: 1.OE Number: The referencing OE number of this water pump impeller are 17370?0001, 3008503, 217308, 8927570, 3N 4859, 3N1888, 3N8459. 2.Fitment: The 12 blade water pump impeller is a replacement for Jabsco, replacement for Caterpillar, replacement for Cummins, replacement for Detroit Diesel. 3.Parameter: The width of this impeller is 3?1/2in, the diameter is 3?3/4, the shaft diameter is 1in, designed with type 5 double flat drive and 12 blades. 4.Function: Used to replace or refurbished the worn out impellers, it could provide higher flow and cooling flows, thus better protecting the ship's engine. 5.Material: Made of marine grade and chemically resistant neoprene and brass, it is reliable, efficient and high performance, designed for long term use. Specification: Item Type: Water Pump Impeller OE Number: 17370?0001, 3008503, 217308, 8927570, 3N 4859, 3N1888, 3N8459 Material: Neoprene, brass Width: Approx. 3-1/2in (88.5mm) Diameter: Approx. 3-3/4in (95mm) Shaft Diameter: Approx. 1in/25mm Drive: Type 5 Double Flat Number Of Blade: 12 Fitment: Replacement for Jabsco Replacement for Caterpillar Replacement for Cummins Replacement for Detroit Diesel Note: Please double check the part number of your item, matching information is for reference only. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks