Oxygen Regulator used with welding machines, has big brass body and steel cover, plastic knob, double gauges, with ... safety valve. Oxygen RegulatorUsed with welding machines, has big brass body and steel cover, plastic knob, double gauges, with safety ... Double gauges6) Diameter: 50mm, 60mm, 63mm7) Steel case and bezel8) Brass connection and internal9) Pressure range: 0-2.5mpa, 0-25mpa10 ...