Chicago Pneumatic Sales manufactures Compressed Natural Gas - CNG Compressor. Chicago Pneumatic Construction Equipment supplies industrial air compressors in the range of tank mounted air compressor, tank mounted air compressor with dryer and other series of air compressors, as well as a full range of 100% oil-free compressors. Compressed Natural Gas - CNG Compressor is totally air cooled. Compressed Natural Gas - CNG Compressor is a complete solution for CNG refueling stations. This CNG compressor is provided with zero gas losses due to pressurized crankcase design. It is available in different models.