19210-ZV5-003 Pump Impeller - Overview. The 19210-ZV5-003 Pump Impeller is a critical component of the Honda marine engine cooling system. It serves as the rotating part of the water pump that generates the necessary flow of cooling water through the engine. This ensures that your Honda marine engines maintain optimal temperature and perform reliably during operation. Made to integrate seamlessly with existing systems, the impeller matches factory specifications, ensuring perfect fitment and dur