16805-ZY6-003 Cup Set - Overview. The 16805-ZY6-003 Cup Set is a crucial component in Honda marine engine systems, specifically designed as part of the water separator system. This part plays an integral role in filtering and separating water from fuel to ensure the engine runs cleanly and efficiently. Precision-engineered to match factory specifications, the cup set ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Designed as a wat