These heavy duty two-stage two-gauge regulators are designed for high volume or continuous use applications to step the pressurised contents of a compressed gas cylinder down to a pressure that can be used in Oxygen/Acetylene Cutting/Welding. Acetylene Double chamber gas control Fits cylinders with vertical outlet valves Two gauges display- Bottle contents and output pressure Pressure controlled by the centre dial Maximum outlet pressure 3.5 Bar Maximum inlet pressure 20 Bar Left hand thread Oxygen Double chamber gas control Fits cylinders with vertical outlet valves Two gauges display- Bottle contents and output pressure Pressure controlled by the centre dial Maximum outlet pressure 10 Bar Right hand thread BS EN ISO 2503:2009.