The F A700DH Regulator and Pressure gauge by Iwata is a piston type pressure regulator with a 0-100psi pressure gauge that is incremented by 2 psi marks. A non-rising and locking adjustment knob comes standard and is hooked up with standard 1/4 inch pipe thread fittings. The air flow direction is signified on the bottom with an arrow. To adjust the air pressure simply pull up on the locking ring and turn knob clockwise to turn pressure down. When desired pressure is set, push locking ring back down.