11321-ZW9-425ZB Case Oil *NHB14M* - Overview. The 11321-ZW9-425ZB Case Oil *NHB14M* is a genuine OEM component designed for Honda marine engine systems. This oil case is integral to the engine's lubrication system, playing a critical role in housing and protecting the oil necessary for efficient engine operation. Manufactured to match factory specifications, the part ensures seamless integration with existing parts, maintaining optimal performance and durability for your marine engine.. Key Feat