80103-GJ5-000 Engine Cover Grom - Overview. The 80103-GJ5-000 Engine Cover Grom is a rubber seal designed for Honda marine engine systems. It provides essential protection by sealing the engine cover, guarding critical engine components from environmental elements such as water intrusion and dust, while also helping to dampen vibrations. Manufactured to exact factory specifications, this part ensures seamless integration with existing hardware and seals, maintaining optimal performance and durab