The Uniweld RUH8210 is a medium/heavy duty single stage oxygen regulator with a machined brass body, polished chrome bonnet, and easy to read single scale, 2 inch, 0-4000 PSI Contents Gauge (Part No. G7S) and 0-200 PSI Delivery Gauge (Part No. G4S). The regulator has a CGA540 inlet connection, “B” Right Hand 9/16 inch -18 Male outlet connection, with a delivery pressure of 5-125 PSI. Product also includes an externally serviceable pressure relief device (PRD) which protects the regulator. The PRD is not designed to protect the downstream equipment. Uniweld single stage regulators are used for general purpose applications where nominal delivery pressure changes, due to decreasing cylinder pressure, do not affect operations. Single stage regulators have greater flow capacity than two stage models. Made in U.S.A.