The Uniweld RUH 8211-2 is a medium/heavy duty single stage acetylene regulator with a machined brass body, polished chrome bonnet, and easy to read single scale, 2 inch, 0-400 PSI Contents Gauge (Part No. G1S) and 0-30 (15-30 Red Line) PSI Delivery Gauge (Part No. G2S). The regulator has a CGA520 inlet connection, “B” Left Hand 9/16 inch -18 Male outlet connections, with a delivery pressure of 2-15 PSI. 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.