41100-ZVL-903ZB Gear NH565 Case - Overview. The 41100-ZVL-903ZB Gear NH565 Case is a critical component in Honda marine engine systems. This gear case supports the marine engine's gear assembly system, housing and protecting the essential gears that facilitate smooth mechanical motion and power transmission. Designed for durability and precision, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine Honda OEM part designed to