Abstract: An apparatus for facilitating the removal of moisture from a compressed air tank has a tank with an interior volume, a tubular member positioned in communication with the tank and having an end adjacent the bottom of the tank, an air compressor interconnected to the tubular member for passing compressed air into the interior volume of the tank, a check valve positioned at an opposite end of the tubular member, a head pressure relief valve in communication with the tubular member, and a pressure switch cooperatively connected to the air compressor. The pressure switch opens the head pressure relief valve when an air pressure in the tank reaches a desired level so as to cause air and water in the tank to pass through the tubular member. The check valve serves to stop the passing of air and water after a period of time.