Airgas Two Stage Brass 0-100 psi High Purity Low Flow Cylinder Regulator CGA-350These two stage regulators are specifically designed for low flow, non corrosive gas applications where precise delivery pressure is critical. They feature a brass piston sensor in the first stage, a stainless steel diaphragm in the second stage and a preset safety relief valve. A sintered brass filter protects internal parts. These two stage regulators are also ideal for medical diagnostic applications, such as blood gas analysis, where precise