Combination Flowmeter and Regulator In One Unit, 4000 PSI/Kg/cm2 * CGA580 Inlet, Maximum Inlet: 3000 PSIG * Self-Centering Flow Tube Keeps Ball Centered To Assure Flow Accuracy * Easy-To-Read 1.5-Inch Contents Gauge with Rubber Gauge Protector * Pressure Relief Safety Device, Solid Brass Body and Fittings