Abstract: The invention provides a pressure equalization or tympanostomy tube for draining and ventilating the middle ear. The tube comprises a short cylindrical body having a first planer extension or flange and a second planer extension or flange. The first flange being equipped with segments which may be trimmed to size to allow for in-theater sizing by a surgeon. In one embodiment, the tube includes a cylindrical bore and in another embodiment, the tube includes a square bore which includes a flap valve for regulating pressure in a patient's middle ear.