41100-Zv4-030za Gear *Nh210mc* Case - Overview. The 41100-ZV4-030ZA Gear *NH210MC* Case is a critical component in Honda marine engine systems. It serves as the housing for the gear mechanism in the lower unit, supporting the propulsion system's functionality and reliability. By protecting and securely encasing the gears, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM part designed specifically for Honda marine engi