Sioux Chief PowerPEX® Oxygen Barrier PEX-B crosslinked polyethylene tubing is designed for use in radiant applications and is suitable for use in concrete slabs. This oxygen barrier PEX tubing ensures system components are protected against harmful oxidation. It?s flexibility aids in allowing loops to be laid out in concrete and between floor joists for efficient and comfortable radiant heating. Plain water or an anti-freeze / water mix is allowable. Sioux Chief PowerPEX® oxygen barrier tubing can also be used in hot and cold potable water distribution. Sioux Chief tubing is corrosion-resistant, chlorine-resistant and has been checked for quality using the best equipment available for PEX extrusion. All Sioux Chief PowerPEX® tube is made in America using the industry's latest methods and equipment and provides the perfect quality and economical solution. Sioux Chief PowerPEX® is backed by 25 year certified warranty.