https://www.cantamedical.com/products/0.137mpa-20psi-oxygen-concentrator.html 0.137mpa (20psi) Oxygen Concentrator The concentration of the oxygen produced by our canta medical oxygen concentrator can be higher than 90%. The flow rate is adjustable in the range of 0-10L/min. Main Features of 0.137mpa (20psi) Oxygen Concentrator This concentrator is reliable and will continue to give you a high level of pure oxygen with 0.137Mpa pressure