40204-ZVP-000 Extension Case Grom - Overview. The 40204-ZVP-000 Extension Case Grom is an essential OEM component for Honda marine engine systems. This extension case grommet is designed to support the rigging system, providing a reliable seal and buffer that prevents water intrusion and vibration within the extension case. Perfectly matching factory specifications and dimensions, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda part designed for marine engine rigging system.. Serves as a protective seal in the extension case reducing water ingress and vibration.. Meets exact factory specifications, tolerances, and dimensions for a perfect fit.. Supports system reliability by maintaining tight connections and preventing damage.. Ensures integration with existing harnesses, hoses, and seals without modification.. Maintains durability and performance consistent with original equipment standards.. Why Cho