40102-ZV5-000 Case (Lower) Grom - Overview. The 40102-ZV5-000 Case (Lower) Grom is a critical component in Honda marine engine systems. It is a rubber grommet that supports the lower case system, playing an essential role in sealing and protecting vital engine components from water ingress and environmental damage. This part ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM component designed specifically for the lower ca