41100-ZVT-000ZB Gear NH565 Case - Overview. The 41100-ZVT-000ZB Gear NH565 Case is a critical component designed specifically for Honda marine engine systems. It serves as a durable gear assembly case that supports the lower unit of the marine engine transmission system, ensuring reliable power transfer and propulsion. Engineered to meet exact OEM specifications, this gear case guarantees seamless integration with existing parts, maintaining optimal performance and durability throughout the engi