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 ... gauges6) Diameter: 50mm, 60mm, 63mm7) Steel case and bezel8) Brass connection and internal9) Pressure range: 0-2.5mpa, 0-25mpa10) ...