Interstate Pneumatics 1/4″ Economy Air Regulator with Gauge, compact design mainly used as a replacement on small portable compressors. WR1120 Series Regulator come with One Gauge Port. These are Stamped to indicate Air Flow Direction. You must choose correct part # for your application. 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. Features three position non-rising knob: push to lock, pull to adjust, detach to make tamper resistant. Increases or decreases air pressure as desired. 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.