31644-ZVP-003 Through bolt - Overview. The 31644-ZVP-003 Through Bolt is a crucial component designed for Honda marine engine systems. This through bolt serves an essential role by securely fastening various engine components together, providing vital structural integrity within the active marine system. Engineered to exact factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda through bolt des