41100-ZVL-901ZB Gear *Nh565* Case - Overview. The 41100-ZVL-901ZB Gear *NH565* Case is an essential component of Honda marine engine systems. Specifically designed to house and protect the gear assembly, it plays a critical role in maintaining reliable mechanical motion and ensuring the longevity of your marine equipment. Crafted to the highest standards, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda Gear Cas