Profile: Redline PEX specializes in distributing PEX tubing, PEX piping, and PEX manifolds for radiant heating & plumbing applications. Oxygen barrier PEX tubing is used in radiant, hydronic, and snow-melt heating applications. The oxygen barrier as per DIN 4726 standard prevents atmospheric gases from entering into the tubing. Gases inside the tubing can corrode the cast iron components of a typical heating system such as circulator pumps, radiators, air scoops, pipes/fittings, and boiler heating elements. Tubing has an oxygen gas barrier, and is suitable for all potable and radiant / hydronic plumbing & heating water applications. It is compatible with crimp/clamp, press, compression, and push fit fittings. Our compression fitting assemblies are used for connection of tubing and manifolds. Fittings consist of a nut, insert, and compression ring made of brass. Insert features double O-ring and seat. Box-end wrench is used to tighten the nut. It is made of solid brass. Double O-rings and a brass compression ring ensure a leak-proof connection.