378415 OMC PISTON-RING SET

The 378415 is a standard piston ring set for OMC Johnson/Evinrude 18 horsepower outboards. The set contains 3 compression and oil control rings per piston, designed for engines from the 1960s era. These rings seal the piston-cylinder interface to maintain combustion pressure and control oil consumption. Available from marine retailers as both new OEM stock and used original equipment. Pricing typically ranges from $28-$32 depending on availability.