40201-ZW6-C00ZA Case Nh246 - Overview. The 40201-ZW6-C00ZA Case Nh246 is an essential extension case component designed specifically for Honda marine engine systems. This part plays a vital role in housing and protecting critical mechanical components, contributing to the reliable functioning of the engine's extension section. Engineered with precision, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine Honda OEM extension case (NH246) designed to meet strict factory specifications.. Precision engineered for perfect fit and alignment within Honda marine engine systems.. Constructed using durable materials suitable for marine environments, ensuring long-lasting service life.. Supports mechanical function by providing protection and housing for internal components.. Maintains water-tight integrity and assists in proper sealing of the extension assembly.. Compatible with Honda marine outboard motors featuring NH246 d