Oxygen Revive is company affiliated with A.P.United Services LLC dedicated to helping those who are in need of oxygen therapy. We help by providing medical oxygen products new and used to buy with low cost and high quality performance. We also specialize in oxygen concentrator repair and services. We are a certified company that assures your oxygen concentrator will be working in proper order at a high quality level within the FDA and manufacturer’s guidelines. One of the greatest features Oxygen Revive has to offer is the opportunity for customers to sell their own used concentrators on Oxygen Revive’s website. (www.oxygenrevive.com)