Yamaha - Water Pump Housing Cooling System Component 6J8-44311-00-00. Overview. The Yamaha Water Pump Housing 6J8-44311-00-00 is one of those parts that keeps your cooling system working right without much attention-until it wears out. When the housing gets scored or warped, you'll start seeing weak water flow or overheating issues pretty quickly. It holds the impeller in place and directs water through the engine, so everything depends on it staying in good shape. If you're rebuilding the pump, this is one of those parts you don't want to overlook.. Key Features. • Controlled Water Flow Channeling - Directs cooling water through the engine to maintain proper operating temperature.. • OEM Fit Precision - Built to Yamaha specifications for proper alignment and secure installation.. • Impeller Support Structure - Holds the impeller correctly for efficient and consistent water movement.. • Corrosion-Resistant Construction - Designed to handle harsh marine environments and long-term use..