90428-PD6-003 Washer (12mm) - Overview. The 90428-PD6-003 Washer (12mm) is a precision-engineered sealing washer designed to support Honda marine and automotive systems. This washer plays a critical role in securing components and distributing pressure evenly to prevent leaks, thereby maintaining the integrity and optimal operation of your equipment. As a genuine OEM part, it guarantees exact fitment and seamless integration with Honda systems, ensuring reliable performance and long-lasting dura