T-Piece A "T-piece ventilation" or "T-piece resuscitator" is a medical device used to assist with breathing in patients who are unable to breathe adequately on their own. It consists of a T-shaped tube with an adjustable pressure valve and two connectors for attaching to a breathing circuit and a patient's airway. During use, the T-piece is attached to an oxygen source and a breathing circuit, and the patient's airway is connected to the other end of the device. The pressure valve i...