40205-ZW6-C00ZA Plate Nh246 - Overview. The 40205-ZW6-C00ZA Plate Nh246 is an essential component within Honda marine engine systems. Acting primarily as a cavitation plate, it plays a critical role in protecting the propeller and gear case assembly by reducing cavitation effects. Installed typically on the extension case system, it helps in maintaining smooth water flow around the propeller, which is vital for optimal engine operation and longevity. Constructed to match exact factory specificat