41100-ZVL-010ZB Gear Nh565 Case - Overview. The 41100-ZVL-010ZB Gear Nh565 Case is a crucial component in Honda marine engine systems. This genuine OEM gear case assembly houses and protects the internal gears responsible for transmitting power from the engine to the propeller, ensuring reliable mechanical motion and optimal boat performance. Designed specifically for seamless integration with Honda marine engines, it supports the gear system by maintaining proper alignment and protection of ess