Profile: Air Compressor Ads is an online source for used air compressors. We specialize in industrial air compressors, vacuum pumps, industrial dryers, compressor parts, trailer mounted compressors, air compressor accessories, industrial air tools, and compressed air equipment. Rotary screw compressors have a smooth, pulse-free air output, with high output volume. The simple design and low maintenance cost makes screw compressors easy to maintain & operate. Oil-free rotary screw air compressors, compress air entirely through the action of the screws. They do not use the assistance of an oil seal, and thus are easier to maintain & environmental friendly. Desiccant dryers significantly reduce water vapor, liquid water, hydrocarbons, and hydrocarbon vapor in the compressed air.