OEM Part: Replacement for Tohatsu, Nissan Outboard 3B2660210M, 3B2-65021-1M, Sierra 18-8920, Parsun Makara F8-04000200, and Mercruiser 47-8037481, 8037481. Great Fitment: This boat water pump impeller is a direct replacement for Mariner Outboard Engines 8hp 4 Stroke standard gearcase from 2005 and 9.9hp 4 Stroke standard gearcase from 2005. Purpose: The flexible 6-blade impeller is designed for marine water pumping applications including engine cooling, water transfer, wash down, and bilge water pumping. Suitable for use in both fresh and saltwater environments. Recommendation: It is recommended to replace the water pump impeller at least once per year, or more frequently based on engine usage. Always carry a spare impeller on board before boating. High Quality Materials: Constructed with premium hardened copper and neoprene rubber for durability and long service life. Designed for reliable performance and ease of maintenance. Item Type: Water Pump Impeller Material: Copper + Neoprene OEM: 3B2-65021-1, 3B2-65021-0M Blades: 6 Height: Approx. 18.50mm / 0.7in Overall Diameter: Approx. 40.00mm / 1.6in Shaft Diameter: Approx. 11.50mm / 0.5in Fitment: Compatible with Mariner Outboard Engines 8hp 4 Stroke standard gearcase (2005 and later) and 9.9hp 4 Stroke standard gearcase (2005 and later)