Roth Industries introduces its innovative 5-layer radiant PEX tubing called DuoPex-c S5. New to the U.S. market, this tubing consists of one EVOH layer connected to an inside and outside Pex-c layer by two adhesive layers. DuoPex-c's main benefit is that it offers protection of the EVOH barrier from mechanical damage and the elements. This tubing also offers great flexibility and maximum durability due to the co-extrusion method-which extrudes in-between and within the layers and avoids de-lamination of the delicate EVOH barrier. This product will replace the existing conventional Pex-c Monopipe beginning in 2007. Roth Industries. Circle 4.