Onix Tubing from Watts Radiant provides several key advantages in radiant heat installations. Onix tubing is composed of two layers of cross-linked Durel EPDM around an “AlumaShield” aluminum oxygen barrier. The AlumaShield adds durability and reduces the risk of worksite damage. The tubing is reinforced with material commonly included in bulletproof shields. Available in sizes ranging from 3/8” to 1”, Onix tubing is flexible, freeze-resistant, and UV-resistant. Backed by a 25-year warranty, Onix tubing cannot be kinked and carries temperature ratings up to 180°F. The tubing requires special fittings and clamps, which do not need special tools for installation. Onix is not compatible with PEX fittings and PEX tools. Go to www.supplyhouse.com to buy Onix Tubing and other Watts products.