90512-ZVL-000 Washer Plain (6mm) - Overview. The 90512-ZVL-000 Washer Plain (6mm) is a fundamental component in Honda marine engine systems, primarily supporting rigging and mounting assemblies. This unplated steel washer, with a precise 6mm inner diameter, plays a crucial role in load distribution between fasteners and surfaces to ensure reliable operation and structural integrity.. Key Features. OEM genuine Honda component designed to meet exact factory specifications.. Provides load spreading