40116-ZY6-000 Cover (Lower) Grom - Overview. The 40116-ZY6-000 Cover (Lower) Grom is an essential component in Honda marine engine systems. It serves as a protective and securing element for wiring, tubing, or rigging bundles under the engine's lower cover, preventing water intrusion and mechanical damage. This ensures the marine system operates reliably and efficiently, maintaining optimal engine performance. Designed as a genuine OEM part, it fits precisely with existing factory hardware and s