16087-ZW5-000 Plain Washer - Overview. The 16087-ZW5-000 Plain Washer is a small, flat metal disc crucial for Honda marine engine systems. It functions to distribute the load of a fastener, preventing damage to surfaces and ensuring the proper fastening of components. This plain washer supports the mechanical integrity of assemblies within the marine engine, helping maintain reliability and durability over time. Engineered to meet Honda's exact factory specifications, this washer guarantees a pe