19220-ZV1-000 Impeller Housing - Overview. The 19220-ZV1-000 Impeller Housing is a critical component within the Honda marine engine cooling system. It securely houses the impeller, ensuring consistent water flow that is essential to engine cooling and protection. This part supports the water pump system, playing an integral role in keeping your Honda marine engine operating reliably by maintaining the proper functioning of the cooling mechanism. Designed to seamlessly integrate with other syste