40105-ZVP-000 Case (Lower) Grom - Overview. The 40105-ZVP-000 Case (Lower) Grom is an essential component within Honda marine engine systems. It serves as a protective enclosure, securing internal parts against water intrusion and environmental damage, ensuring the reliable operation of your marine engine. Designed specifically to support rigging systems, it guarantees seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM lower case