Interstate Pneumatics 3/8″ Regulator, 0-125 psi – w/Gauge. Pneumatic equipment that operates at higher than recommended pressure can cause excess torque, force and wear and can waste compressed air. This unit regulates air pressure of the air line to prevent damage. Provides fine air control for spray guns and air tools. It adopts balanced inlet with relief device. It has the advantage of stable pressure, high precision, quick reaction & firm lockup. It can be freely combined with other air source treatment products.