91302-ZV5-821 O-Ring (1.8x69.6) - Overview. The 91302-ZV5-821 O-Ring (1.8x69.6) is a precision Honda marine engine sealing component designed for use within the fuel or coolant systems, helping to maintain system integrity by preventing fluid leaks in Honda marine engine systems. Specifically crafted to correspond with the exact OEM specifications, this O-ring ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. This O-ring measures 1.8