40210-ZVA-000 Vertical Shaft Bush - Overview. The 40210-ZVA-000 Vertical Shaft Bush is a vital OEM component designed for Honda marine engine systems. This bush supports the vertical shaft in the engine's lower unit, providing essential wear protection and ensuring smooth, efficient operation within the propulsion system. Crafted to meet exact factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Vertical shaft