Bosung Engineering (보성엔지니어링) is a company supplying ship's spare parts and marine machinery equipment. It operates through two divisions: Diesel Engine Business and Marine Machinery Business. The Diesel Engine Business division provides piston crowns and cylinder liners, fuel pumps and pump barrels, peaston rings, bearings, etc. The Marine Machinery Business division distributes purifiers, air compressors, refrigiration machines, provision cranes, and other equipment.