The MERCURY® pressure regulators, complete with an integrated cylinder valve, are suitable for direct mounting on oxygen cylinders using the threaded connector 25E (EN629-1) or 17E (EN ISO 11116-1). The MERCURY® pressure regulators have a refilling valve appropriate to the required standards of the country of destination. An ergonomic knob allows the user to quickly open and close the cylinder flow, and gives a clear indication about the status of the system (ON-OFF). This device has a double stage preset output pressure, with a control gauge to indicate the pressure in the gas cylinder. The MERCURY® pressure regulator has a chrome-plated brass structure and is equipped with a preset overpressure valve as a protection against any malfunction in the system. A flowmeter with calibrated orifices supplies the gas through a hose connector with flow adjustable from 2 to 14 L/min, in intervals of 2 L/min. A terminal unit (optional) can be integrated to supply emergency apparatus.