Abstract: A drain device that removes oil, water, sludge and other contaminants from compressed air systems comprising a cylindrical housing for attachment between diametrically opposed compressed air and drain lines, a cylindrical rotor rotatably journalled within the housing, a single port, at least as large as the inside diameter of the air line, through the wall of the rotor, the port being positioned for sequential alignment with the air and drain lines, when the rotor is actuated and a pair of bleeder valves between the interior chamber of the rotor and the atmosphere including respective cam tracks positioned on end walls of the rotor and housing to open the valves when the rotor port is aligned with the discharge line.