SUPPLYGIANT pre-insulated oxygen barrier PEX-A tubing is designed for hydronic heating and cooling applications, including radiant floor heating and snow melt systems. Manufactured using the PEX-A (Engel) method, the tubing provides flexibility and durability for hydronic system installations. The integrated oxygen barrier layer helps limit oxygen diffusion into the system, helping protect boilers, pumps, and other ferrous components from corrosion. The tubing is pre-insulated with 1/2 in. (15 mm) polyethylene (PE) foam insulation to help reduce heat transfer and maintain system efficiency. The convenient 100 ft center-pull coil design simplifies handling and installation. Rated for 200°F at 80 psi, 180°F at 100 psi, and 73.4°F at 160 psi. Insulation R-value R-3.6 for 3/4 in tubing. Thermal conductivity 0.25 Btu·in/sq.ft·hr·°F. Manufactured to ASTM F876, ASTM F877, ASTM F2023, ASTM F1960, CSA B137.5, CSA B214, ANSI/NSF 14, ANSI/NSF 61, ULCS102/ASTM E84, and AWWA C904 standards.