Ameriflame R350-540 Heavy Duty Single Stage Oxygen Regulator with CGA540 Inlet Easy-To-Read Dual Scale 2.5-Inch Gauges, 200 and 4000 PSI/Kg CGA540 Inlet, Maximum Inlet: 3000 PSIG Large Brass T-Handle For Smooth, Accurate Adjustments Reseating Pressure Relief Device Where Needed For Added Regulator Protection Forged Brass Bonnet and Body