Features 1.Replacement OEM: 387361 763735 777831 0387361 0763735 0777831 and replacement for Sierra 183090 replacement for CEF 500354 replacement for Mallory 945210. 2.Ideal Application: The water pump impeller is a wonderful replacement for Johnson Evinrude Outboard 2hp 19851990 4hp 19761980 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 ImpellerMaterial: Copper + NeopreneOEM: 387361 763735 777831 0387361 0763735 0777831 and replacement for Sierra 18-3090 replacement for CEF 500354 replacement for Mallory 9-45210.Blades: 6Height: Approx. 17.82mm/0.7inOuter diameter: Approx. 38.27mm/1.5inInner Shaft Insertion Diameter: Approx. 11.23mm/0.4inFitment: Replacement for Johnson Evinrude Outboard 2hp 19851990Replacement for Johnson Evinrude Outboard 4hp 1976-1980 90 degree gearcaseReplacement for Johnson Evinrude Outboard 6hp 1979 engine Package List 1 xWater 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!