31261-Zvp-003 Through Bolt - Overview. The 31261-ZVP-003 Through Bolt is an essential component designed to support Honda marine engine systems. This through bolt plays a crucial role in maintaining the structural integrity and reliable operation of various marine engine assemblies by securely fastening components together. Engineered to meet strict factory specifications, the 31261-ZVP-003 Through Bolt ensures seamless integration with existing parts, maintaining optimal performance and durabil