Ideal for outlet use of the air compressor. Provides passage of water microparticles which cause great damage to air tools over time. Microparticles which are created as a result of condensation due to the temperature difference between the inside and the outside of the compressor. Creates the possibility for lubrication of tools with pneumatic oil. Oil which is very necessary to avoid friction between the gears and their consumption over time. With pressure regulator, it serves both as a filter and as a pressure regulator that drives the mechanisms of operation of the air.