91304-ME5-003 O-RING (5.1X2.2) - Overview. The 91304-ME5-003 O-RING (5.1X2.2) is an essential sealing component used in Honda marine engine systems. This O-ring supports sealing functions in fuel and fluid systems, preventing leaks and maintaining system integrity. Designed to factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precision O-ring with dimensions 5.1mm inner diameter and 2.2mm cross-section.. OE