40102-ZVD-600 Case Grommet A - Overview. The 40102-ZVD-600 Case Grommet A is a vital rubber sealing component specifically designed for the Honda marine engine system. It serves as a protective grommet that seals and isolates the rigging harnesses or cables as they pass through the engine case. This part helps to prevent water intrusion, dirt, and contaminants from entering key areas while also providing vibration dampening, ensuring the longevity and reliable operation of Honda marine equipment