41100-ZVL-700ZB Gear *NH565* Case - Overview. The 41100-ZVL-700ZB Gear *NH565* Case is a vital component of the gear system in Honda marine engine systems. It plays a crucial role in housing and protecting the internal gears that transmit mechanical power from the engine to the propeller, ensuring efficient propulsion and reliable operation. Designed to meet strict factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Fe