41100-ZVL-801ZA Gear Nh565 Case - Overview. The 41100-ZVL-801ZA Gear Nh565 Case is a critical gear case assembly designed to support Honda marine engine systems, specifically optimized for the Honda Active Marine propulsion system. This OEM gear case plays a vital role in maintaining the mechanical integrity and smooth transmission of power within the marine engine, ensuring reliable operation under demanding marine conditions. Manufactured to meet strict factory specifications, this gear case e