PAG pneumatic pumps are provided for centralized lubrication systems with grease where progressive distributor are used. The drive of the unit is carried out by a simple-action pneumatic piston, which is controlled by compressed air. The piston comes back by means of a spring. The plastic or steel reservoir is installed in the upper part and is equipped with a spring and a follower plate. It is also provided with low level switch and filler strainer. They can be used for medium/big machine.