Air preparation units are systems which are used to improve the quality of compressed air being fed into pneumatic products in order to improve their life as well as control the pressure / flow of shop compressed air. They consist mainly of the following, (a) Filters : To remove moisture in the compressed air (b) Regulator: To regulate and control the pressure of air being fed into the pneumatic systems (c) Lubricator : To add oil to the compressed air which in turn lubricates the moving parts / seals in a pneumatic system thus increasing the overall life of the system.