Yamaha - Impeller - 689-44352-02-00Yamaha Water Pump Impeller Cooling System Component 689 44352 02 00 Overview The water pump impeller is a vital component of your Yamaha outboards cooling system, responsible for drawing water into the pump and circulating it through the engine. This continuous water flow helps regulate engine temperature and prevents overheating during operation. Constructed from durable, flexible rubber, the impeller is designed to withstand constant rotation and