PE-Xa EVOH pipes also named PE-Xa Anti Oxygen Pipe or PE-Xa Oxygen Barrier Pipe. The Oxygen Barrier EVOH (Ethylene-vinyl Alcohol Copolymer) is a layer of coating applied to the exterior surface of PE-Xa Pipe. The layer can effectively prevent oxygen from entering the piping system which will protect the pipes and fittings from rapid corrosion, and extend the working life of metal valves, switches and distributors in the piping system. It can also prevent the growth of microbes and algae, ensuring that the pipes are clean and smooth.