90402-ZY3-000 Washer Plain (8mm) - Overview. The 90402-ZY3-000 Washer Plain (8mm) is a fundamental hardware component used in Honda marine engine systems. This plain washer supports the rigging and fastening system by distributing load evenly when tightened, helping to prevent damage to connected parts. As an OEM part, it guarantees precise fit and reliable function essential to maintaining the integrity and operation of your marine equipment. Crafted to meet exact factory dimensions and toleran