The terminal unit for the evacuation of anesthetic gases is essentially the connection point between the receiving system to which the operator makes connections and disconnections and the exhaust system. The terminal drive outlet includes a restraint system that opens the gas passage when the graft is connected and automatically closes when the graft is disconnected. The base block was designed and built for a permanent connection to the exhaust system. Materials used: CW614N chrome brass for the body and other details. Aluminium chrome for the outer dial. INOX steel for plugs, C98 steel for springs. NBR gum for polycarbonate seals for labels and copper for the outgoing pipe. All materials used are compatible with medical gases and anesthetic vapours in the specified temperature range.