16718-ZZ5-003 Insulator - Overview. The 16718-ZZ5-003 insulator is a vital component within Honda marine engine systems. Designed primarily to prevent electrical conductivity and isolate vibrations, this part supports the fuel vapor separator system by cushioning and protecting critical engine components. By absorbing engine vibrations and providing insulation, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. The insulator is a r