91306-ZY3-003 O-Ring (23.5X2) - Overview. The 91306-ZY3-003 O-Ring (23.5X2) is a vital sealing component in Honda marine engine systems. This O-ring supports the engine's cooling and water pump systems by preventing fluid leaks and maintaining optimal pressure. Manufactured to exact Honda specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precision molded O-ring with dimensions of 23.5mm outer diameter and 2mm thick