40201-ZW9-C10ZA Ext*Nh282mu* Case - Overview. The 40201-ZW9-C10ZA Ext*Nh282mu* Case is an essential OEM extension case component designed specifically for Honda marine engine systems. It serves as part of the gear and extension assembly, contributing to optimal housing protection and structural integrity for the engine's midsection. Built to factory specifications and exact tolerances, this case supports the mechanical function and water flow efficiency within the outboard motor system. Its Oyst