Oxygen plays a very important role in the scrap industry: it is used with oxy-fuel cutting to break down metal pieces of scrap before recycling. The Deployable Oxygen Concentrator System (DOCS) can be directly connected to a cutting torch to be used instantly. If the mode of cylinder oxygen is preferred, then the DOCS unit is capable of filling up cylinders at 2,000-2,650 psig (138 – 183 barg) of fill pressure.