The standard BS terminal units are those points, fixed or flying, of a medical gas distribution system on which the user makes frequent connections and detachments to take the different gases intended to power the anesthesia, ventilation, and medical use equipment in general. Because an incorrect connection can endanger the patient’s life, it is important that the terminal units and their components are safely installed. Materials used: CW614N chrome brass for the body and other details, chrome aluminum for the outer ring, INOX steel for plugs, C98 steel for springs, NBR rubber or VITON power for seals. All DIN terminal units have a manual-activated dispensing lock system on the basis.