The terminal unit for anesthetic gas evacuation is essentially the connection point between the receiving system to which the operator makes connections and disconnections and the exhaust system. The terminal unit socket includes a retaining system that opens the gas passage when the plug is connected and closes automatically when the plug is disconnected. The base block is designed and constructed for permanent connection to the exhaust system. Materials used: chrome-plated CW614N brass for the body and other details. Chrome-plated aluminum for the outer ferrule. Stainless steel for pins, C98 steel for springs. NBR rubber for gaskets Polycarbonate for labels and copper for tube outlet. All materials used are compatible with medical gases and anesthetic vapors in the specified temperature range.