1、Replacement OEM: 387361, 763735, 777831, 0387361, 0763735, 0777831, and replacement for Sierra 18‑3090, replacement for CEF 500354, replacement for Mallory 9‑45210. 2、Ideal Application: The water pump impeller is a wonderful replacement for Johnson Evinrude Outboard 2hp 1985‑1990, 4hp 1976‑1980 90 degree gearcase and 6hp 1979 engine. 3、Powerful Function: The heavy duty impeller is used for marine water pumping such as engine cooling, water transfer, wash down and bilge water pumping purposes, suitable for fresh or sea water. 4、Suggestions: You should replace your flexible pump impellers at least once every year or sooner depending on the engine duty. Always carry spare impellers on board before boating activities. 5、High Performance: The flexible 6 blades impeller is carefully made of premium hardened copper and neoprene rubber, providing reliable, efficient and long lasting performance. Item Type: Water Pump Impeller Material: Copper + Neoprene OEM: 387361, 763735, 777831, 0387361, 0763735, 0777831, and replacement for Sierra 18-3090, replacement for CEF 500354, replacement for Mallory 9-45210. Blades: 6 Height: Approx. 17.82mm/0.7in Outer diameter: Approx. 38.27mm/1.5in Inner Shaft Insertion Diameter: Approx. 11.23mm/0.4in Fitment: Replacement for Johnson Evinrude Outboard 2hp 1985‑1990 Replacement for Johnson Evinrude Outboard 4hp 1976-1980 90 degree gearcase Replacement for Johnson Evinrude Outboard 6hp 1979 engine 1 x Water Pump Impeller