A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor.Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. Ultimamac has wide variety of Compressors Spare parts. You can get Original Compressors Spares under one roof from Authorized and genuine dealer at the lowest price.