1/2" Inch x 300 ft Pex Tubing Oxygen O2 Barrier EVOH, Pex-B Red 300 ft for Radiant Floor Heat (From VIVO) 1/2" by 300ft Roll of Pex Tubing (red) Oxygen Barrier (EVOH) In-Floor Heating Application ASTM F876, ASTM F877, CSA B137.5, and ANSI/NSF 14 Certified 25 Year Factory Warranty