Porter Cable Regulator with Gauge 1 4" NPT Abrasive Media The benefit of Non bleed is Horizontal Orientation The benefit of Non bleed is that air only passes through the gun when the trigger is pulled resulting in less blowing around of shop dust and less paint buildup on the tip of the nozzle Sealed maintenance free crankcase manufactured from fully anodized die cast aluminum for corrosion protection and is sealed to prevent contamination and lube failure push to lock adjustment knob on the regulator provides easy operation The pressure regulator allows the user to adjust the air compressor pressure depending on the air tool being used