91305-KF0-003 O-Ring (27X2) - Overview. The 91305-KF0-003 O-Ring (27X2) is a critical sealing component used in Honda marine engine systems. This 27mm outer diameter and 2mm thick rubber seal plays a vital role in maintaining engine integrity by preventing fluid and gas leaks. Commonly applied in systems such as left crankcase covers, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precision O-ring seal with 27mm diameter and 2m