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AirPhysio Oscillating Positive Expiratory Pressure (OPEP) device is a respiratory therapy device designed to assist in the clearance of excess mucus from the lungs, helping you remove pollution, bacteria, pollutants, smoke and other foreign particles. The device also assists in enhancing lung capacity by assisting to remove blockages and to open blocked or semi blocked airways in the lungs, helping to improve gas transfer between Oxygen and Carbon Dioxide.