41100-ZVT-601ZB Gear *NH565* Case - Overview. The 41100-ZVT-601ZB Gear *NH565* Case is a critical component within Honda marine engine systems, particularly designed for outboard motor gear assemblies. This gear case serves an essential role in housing and protecting the gearing mechanism that converts engine power into propeller rotation, thereby enabling smooth and reliable propulsion of your marine vessel. Engineered for durability, it ensures seamless integration with existing parts, maintai