1OE Number: The referencing OE number of this water pump impeller are 17370?0001, 3008503, 217308, 8927570, 3N 4859, 3N1888, 3N8459. 2Fitment: The 12 blade water pump impeller is a replacement for Jabsco, replacement for Caterpillar, replacement for Cummins, replacement for Detroit Diesel. 3Parameter: 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. 4Function: Used to replace or refurbished the worn out impellers, it could provide higher flow and cooling flows, thus better protecting the ship's engine. 5Material: Made of marine grade and chemically resistant neoprene and brass, it is reliable, efficient and high performance, designed for long term use.