40108-ZW9-000 Oil Case Grommet D - Overview. The 40108-ZW9-000 Oil Case Grommet D is a critical sealing component within the oil case system of Honda marine engine systems. Designed to prevent oil leaks and maintain a sealed environment, this grommet ensures the oil remains contained, supporting the overall reliability and longevity of the engine. As an OEM genuine part, it guarantees seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Specifi