Uniweld RUH8210 Medium/Heavy Duty Single Stage Oxygen Regulator with a CGA540 Inlet 2" Tri-layered reinforced neoprene diaphragm. CGA540 Inlet, Maximum Inlet:3000 PSIG Large Brass T-handle for Smooth, Accurate Adjustments. Externally serviceable reseating pressure relief device (PRD). PRD not designed to protect downstream equipment. Delivery pressure: 5-125 PSIG