40107-ZW9-720 Oil Case Grommet F - Overview. The 40107-ZW9-720 Oil Case Grommet F is a critical rubber seal component used in Honda marine engine systems, specifically designed for oil case sealing. This grommet supports the lubrication system by preventing oil leaks and contamination, ensuring the engine operates reliably and efficiently. Made to meet exact Honda factory tolerances, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Feature