Feature: 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. Specification: 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. Package List: 1 x Water Pump Impeller Note: 1. Please double check the part number of your item, matching information is for reference only.2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!