Below is a list of Air Compressor Filters manufacturers from Litchfield, Illinois. Air compressor filters, or compressed air filters, are essential elements to air compression systems, by removing water, oil, dust, vapors and other contaminants from a compressed air supply, filters prolong the useful life of the compressor and its applications. Air compressors are machines that decrease the volume of a given quantity of air thus compressing it for directed use in many applications.