30430-ZVP-U00 Case Assembly (2nd) - Overview. The 30430-ZVP-U00 Case Assembly (2nd) is an essential component within Honda marine engine systems, supporting the transmission system by housing the second gear set. This part plays a crucial role in ensuring the efficient operation of the gearbox, thus maintaining reliable mechanical motion and smooth shifting performance under demanding marine conditions. Engineered to exact factory specifications, it ensures seamless integration with existing par