19315-ZX2-000ZA Cover *NH8* - Overview. The 19315-ZX2-000ZA Cover *NH8* is a genuine OEM part designed specifically for Honda marine engine systems. Serving as a thermostat cover, this part plays a crucial role in protecting the thermostat and related components from environmental exposure and wear. This cover contributes to maintaining efficient system temperature regulation, ensuring reliable engine operation and longevity. Engineered to align perfectly with factory specifications, it ensures