63722-ZY3-010ZD Cap, Cover *NH565* - Overview. The 63722-ZY3-010ZD Cap, Cover *NH565* is a critical component designed for Honda marine engine systems. This cover supports the engine's protective system by sealing and shielding crucial parts from water, dirt, and debris intrusion, ensuring reliable operation on the water. Built to OEM factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda part