1.CONSTAB PEX material 2.Oxygen barrier 3.Factory price 4.AENOR,WATERMARK,EME certificate 5.Samples ... delivery,QUALITY IS VITAL.We have perfect quality control management system.4.Handle & install easy,chemical resistance,environmental friendly,ultraviolet ... layers,with pex inside,oxygen barrier outside,and glue in the middle.6.Applications: floor heating system,drinking water supply,liquild food ...