17703-921-000 Band (20mm) - Overview. The 17703-921-000 Band (20mm) is an essential component within Honda marine engine systems. This 20mm band functions primarily as a tube clip designed to secure tubing or hoses, ensuring they remain safely in place during engine operation. By preventing dislodgment or leaks, it helps maintain the reliability and efficiency of the marine engine system. Crafted to meet Honda's stringent OEM specifications, it ensures seamless integration with existing parts, m