Dual stage diaphragm pressure reducer. Input high pressure manometer. Output low pressure manometer. Low pressure oxygen output with compatible fitting with PTFE 4×2,5 mm Alnitec pipe. Compatible with all the existing connection fittings, using the threading 1/4′ NPT. Connectable with medical oxygen tank or with hospital oxygen wall outlet . Safety relief valve for overpressure. High stability outlet pressure. Accurate pressure control knob. “No oil” manometers.