The Oxyll selector flowmeter has a revolving knob controller which supplies oxygen to the face mask via the direct outlet or through the humidifier. Its specially designed flowmeter saves oxygen as well as time. This user-friendly device is virtually maintenance free. It?s highly effective and ensures that there is no interruption to the oxygen supply during this operation. The Oxyll selector has a chromium-plated brass body, an inner and external tube made from polycarbonate, and a stainless steel ball. The accurate device distributes 0 to 15 l/min and the flow remains unaffected by any output restrictions caused by nebulizers, humidifiers or other equipment.