Oxygen barrier PEX tubing has the same properties as non-barrier PEX pipes, but it prevents oxygen and other elements from infiltrating and damaging delicate heating system components. For example, it keeps boilers from rusting. Bluefin PEX pipe is made of polyethelene which is cross-linked to enhance performance and maintain the properties of thermoplastics. Furthermore, this tubing can be installed in a variety of ways, such as using the crimp, clamp, or fitting systems. Bluefin offers a 25-year warranty on the product.