90543-ZVD-000 Washer Plain (10mm) - Overview. The 90543-ZVD-000 Washer Plain (10MM) is a fundamental hardware component used in Honda marine engine systems. This plain washer supports various fastening functions by distributing load evenly across joined parts, preventing damage and ensuring tight, reliable connections. Designed for durability and precision, it helps keep marine equipment operating reliably in demanding environments. As a genuine OEM part, it ensures seamless integration with exi