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Many aircraft have systems installed that provide a fixed flow at the user outlet with little of no reduction in the pressures from the regulator. These systems use connector with tiny orifices as the final reduction in pressure to a usable level for breathing with a mask that provides oxygen levels based on the service ceilings of the aircraft type. With this setting and orifice installed the system provides excess (loss or wasted oxygen) at lower altitudes but provides adequate oxygen levels for the maximum altitude the aircraft might obtain. Having too much oxygen isn't especially dangerous but can cause headaches, excessive dehydration and drying and leave users some discomfort. Because of this you we cannot use simple connectors without having the proper orifice installed to reduce the flow. We can supply some types with the orifice for a fixed altitude but must know the aircraft type. A better and far more efficient system, the Aerox retrofit kits with adjustable needle valves and Flowmeters allows the use of the more comfortable and preferred Cannulas or the use of conventional masks and also reduced oxygen wasted by fixed systems.