91308-ZV5-821 O-Ring (1.5x19.5) - Overview. The 91308-ZV5-821 O-Ring (1.5x19.5) is a vital sealing component within Honda marine engine systems. This precision-engineered O-ring provides a reliable seal to prevent leaks in critical fuel, power trim, and other engine subsystems, ensuring the system operates without interruption or damage. Crafted to integrate seamlessly with existing Honda marine hardware, it maintains optimal performance and durability in challenging marine environments.. Key Fe