41100-ZVL-703ZB Gear *NH565* Case - Overview. The 41100-ZVL-703ZB Gear *NH565* Case is an essential component of Honda marine engine systems, designed specifically to support the drivetrain system of Honda Aqua-Trax personal watercraft and other marine applications. Its primary role is to house the gear assembly, ensuring seamless operation of mechanical motion and power transfer within the engine. Manufactured to precise factory specifications, this case guarantees reliable performance by provi