41100-ZVT-610ZB Gear *NH565* Case - Overview. The 41100-ZVT-610ZB Gear *NH565* Case is a vital component of Honda marine engine systems, specifically designed to house and protect the NH565 gear mechanism. It plays an essential role in transferring power efficiently within the marine gearbox assembly, ensuring seamless control over the boat's propeller motion. This genuine Honda part maintains optimal operation and reliability by integrating perfectly with existing engine hardware and seals.. Ke