121 - 500 cfm Pneumatic VT4 Tractor Compressor Bearing Cup, Model Number/Name: 134, Maximum Flow Rate (cfm): 85kg/Cm2

It's used for Tractor mounted ,A VT4 compressor (Two Cylinder, Two Stage Reciprocating Air Compressor) is a device that converts power (usually from an electric motor, a diesel engine or a gasoline engine) into potential energy by forcing air into a smaller volume and thus increasing its pressure.