19210-ZY3-023 Pump Impeller - Overview. The 19210-ZY3-023 Pump Impeller is a vital rotating part within Honda marine engine water pump systems. Its primary role is to generate the flow of water necessary for cooling the engine and other marine applications. This part supports the water pump system to maintain reliable operation and prevent engine overheating. Carefully designed and manufactured to match Honda's factory specifications, this impeller ensures seamless integration with existing part