Supply Cummins air compressor 1, box, front and rear cover, a bottom cover use of coated sand for sand 2, crankshaft forging hit piece 3, a connecting rod forging hit piece 4, infiltration ceramics piston ring is suitable for the use of Cummins, Yuchai series heavy-duty heavy-duty vehicles and engineering machinery, buses and other. Features: large amount of exhaust gas, high gas speed, stable performance, long life.