40105-ZW5-000 Case (Lower) Grom - Overview. The 40105-ZW5-000 Case (Lower) Grom is an essential rubber grommet component for Honda marine engine systems, playing a critical role in sealing and protecting rigging hoses and electrical cables as they pass through the engine's lower casing. By providing a robust seal, it ensures seamless integration with existing parts, maintaining optimal performance and durability even in harsh marine environments.. Key Features. OEM Honda rubber grommet designed