19221-ZY3-010 Impeller Housing - Overview. The 19221-ZY3-010 Impeller Housing is a vital component of Honda marine engine systems, specifically designed to house and protect the impeller within the water pump system. It plays a critical role in maintaining efficient water flow for engine cooling, ensuring your marine engine operates reliably and at peak performance. Manufactured following Honda's stringent OEM standards, this Impeller Housing integrates seamlessly with existing water pump compon