Yamaha - Water Pump Housing Cooling System Component 6H3-44311-00-00. Overview. The Yamaha Water Pump Housing 6H3-44311-00-00 is one of those parts that keeps your cooling system working the way it should without much attention-until it wears out. When the housing gets scored, warped, or cracked, you'll start seeing weak water flow or overheating issues pretty quickly. It's what holds the impeller in place and directs water through the engine, so everything depends on it staying solid. If you're rebuilding the water pump, this is one of those parts you don't skip.. 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 in position for efficient and consistent water movement.. • Corrosion-Resistant Construction - Designed to withstand harsh marine environments