308621 OMC O-RING

OMC 308621 is a genuine o-ring seal used in Johnson Evinrude sterndrive and outboard motor assemblies, commonly positioned to seal retainer housing interfaces. This elastomer ring prevents oil and coolant leakage at critical seal points within the engine block or lower unit. Available as original equipment from multiple marine retailers including eBay and specialty dealers, it is a high-demand replacement part for routine maintenance and gearcase rebuilds on vintage OMC motors.