Automatic Filling Machine SPS 104 Pneumatic Type An automatic filling machine pneumatic-type is a piece of a machine whose components run on compressed air instead of electrical signals. In simpler terms, pneumatic fillers are operated or controlled by gas or air under pressure. The pneumatic type automatic machines are a good choice if you are dealing with liquids as they avoid a disastrous possibility of spark or arc. A spark while working with a flammable liquid can have dangerous consequences, so the removal of electricity from the equation assures the safety of the equipment and the operator. At times some harsh chemicals, even the fumes may react negatively and can create a situation of an arc or a spark from an electrical component.