Capital Compressors stocks Piston Compressor for Many Applications. When you need a compressor that will meet your low compressed air requirements or High Pressure up to 40 Bar the Chicago Pneumatic piston compressors will do the job. These piston compressors come in many different versions and are used in applications where compressed air usages are low or require High Pressure. This means that we are sure to have a piston or booster compressor suitable for your Industrial or Professional application.