90401-ZV5-822 Plain Washer - Overview. The 90401-ZV5-822 Plain Washer is a fundamental component used within Honda marine engine systems. This simple yet vital metal ring functions to evenly distribute load from fasteners, preventing damage to mating surfaces and ensuring mechanical stability. As a genuine OEM part, it supports the structural integrity and reliable operation of your marine equipment, seamlessly integrating with other components for long-lasting performance.. Key Features. The pl