90407-ZY3-D01 Sealing Washer - Overview. The 90407-ZY3-D01 Sealing Washer is a critical component designed to support Honda marine engine systems by creating a watertight seal that prevents leaks and maintains the engine's integrity. This sealing washer plays an essential role in preserving system reliability by ensuring that fluid and water systems within the engine remain sealed and protected from contamination. Engineered to exact factory specifications, it fits seamlessly with existing hardw