Tec 4 vaporizers are designed for 'out of circuit' use in continuous flow techniques of inhalation anesthesia.  The vaporizers are temperature and flow compensated.  A single control dial, with a concentration scale calibrated in % of anesthetic agent.  To prevent accidental displacement of the cotrol dial from the 'OFF' position to an 'ON', a release button is incorporated into the dial assembly.  The Tec 4 can only be turned "ON' when the locking lever is turned to the 'LOCK' position.  Liquid Capacity:  Amount of anesthetic agent to fully charge the vaporizer=125ml.  Weight: 16.785 lbs (7.6 kg)