Standards and ratings marked every 5 feet on the pex tubing. Expansion PEX pipe provides superior durability, corrosion resistance and flexibility for the most demanding environments. It is available in red, white and blue for easy and simple identification of hot, cold and main water lines Radiant - MrPEX® PEX-a Tubing w/ Oxygen Barrier PEX TUBING SIZE: 1/2 Inch x 100 Feet- ., 0., 475 inner diameter (ID) 0., 625 outer diameter (OD) 1 nominal diameter. It is compatible with both expansion and crimp, clamp or sleeve methods of joining. Crack resistant and freeze resistant material can expand and then shrink back to normal size, and coil will easily straighten back to its original shape. Approved for water service lines and burial applications- including burial under concrete. Freeze Resistant PEX Tubing Chauffage Radiant 1/2-inch PEX-B Oxygen Barrier Tubing - 300 Ft Red Coil For Radiant Floor Heating Garage Water Barrier Oxygen Tubing APPROVALS: Complies to ANSI, ASTM, CAN/ULC, CSA. Ideal for homeowners installing radiant floor heating systems for efficient and durable hot water distribution. Contractors. Perfect for contractors needing... Expansion PEX pipe provides superior durability, corrosion resistance and flexibility for the most demanding environments. It is available in red, white and blue for easy and simple identification of hot, cold and main water lines.