40105-ZVL-910 Case (Lower) Grom - Overview. The 40105-ZVL-910 Case (Lower) Grom is a critical component in Honda marine engine systems. This genuine OEM lower case grommet is designed to protect and secure cable or line routing within the hull structure of boats, ensuring system integrity and reducing water intrusion. Specifically engineered to meet Honda's exact factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Feat