40201-ZW9-020ZB Case Nhb14m - Overview. The 40201-ZW9-020ZB Case Nhb14m is a critical component in Honda marine engine systems. This extension case plays an essential role in housing and protecting vital mechanical parts within the marine environment, especially designed for Honda Active Marine applications. By maintaining the protection and structural integrity of the assembly, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Ge