19240-ZY1-C20 Water Pump Housing - Overview. The 19240-ZY1-C20 Water Pump Housing is a critical component within Honda marine engine systems. It serves as the protective casing for the water pump, a key part of the engine's cooling system. This housing supports the efficient circulation of cooling water, preventing engine overheating and maintaining reliable operation. Designed specifically for Honda marine outboard engines, it ensures seamless integration with existing parts, maintaining optima