Features: 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 displacementof 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.