90401-ZVA-000 Washer (6mm) - Overview. The 90401-ZVA-000 Washer (6mm) is an essential component within Honda marine engine systems. It supports the mechanical assembly system by providing a stable, flat bearing surface that distributes load evenly across connected parts, ensuring the integrity and reliability of the engine assembly. Designed specifically for marine applications, it plays a crucial role in maintaining reliable engine operation and contributing to the longevity of your Honda marin