91301-PM7-003 O-Ring (7.3X2.2) - Overview. The 91301-PM7-003 O-Ring (7.3X2.2) is an essential sealing component used in Honda marine engine systems, primarily functioning within the fuel injection system to ensure a tight seal and prevent leaks. This small yet vital part supports the integrity and reliability of the fuel system, helping maintain consistent engine performance and efficiency. Designed with precise dimensions of 7.3 mm inner diameter and 2.2 mm cross-section, it ensures seamless in