90430-PD6-003 Washer (6mm) - Overview. The 90430-PD6-003 Washer (6mm) is a genuine OEM sealing washer designed for Honda marine engine systems. As an essential component, this washer functions within the fuel tank and associated systems to provide a reliable seal and proper spacing for fasteners. By preventing leaks and maintaining correct tension, it helps ensure seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Flat metal washer type desig