Yamaha Motor Company 6R3-44322-40 Cartridge Insert

The Yamaha 6R3-44322-40-00 Cartridge Insert is a genuine Yamaha replacement component that directs and regulates cooling water flow within the water pump housing of marine outboard engines. It is designed for Yamaha outboards in the 115 HP–250 HP range and sits in the water pump housing or lower unit cooling passages to maintain proper coolant flow for Yamaha 2-stroke and high-horsepower models. Made from corrosion-resistant composite or metal alloy, this precision-fit cartridge insert supports reliable cooling performance and consistent engine temperature under demanding marine operating conditions. Maintenance teams and marine technicians use this part for replacement, repair, and restoration of worn or restricted cooling system components.