16406-ZVL-000 Throttle Body Guard - Overview. The 16406-ZVL-000 Throttle Body Guard is a protective component designed specifically for Honda marine engine systems. This guard shields the throttle body to prevent damage from external elements such as debris and physical impact, ensuring the throttle body maintains optimal function. By providing robust protection, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Designed to shield