This listing is for one roll of 500 feet of 1 1/4 inch Oxygen Barrier PEX B Tubing. BHS PEX tubing is made to the following specifications: - Outer Diameter (OD): 1.375 inches - Inner Diameter (ID): 1.054 inches - Wall Thickness: 0.16 inches - Weight per foot: 0.25 pounds - Meets ASTM 876/877 standards - Not to be installed in direct sunlight - Made to ASTM specifications - Rated at 100 psi at 180 degrees Fahrenheit - Rated at 80 psi at 200 degrees Fahrenheit - Rated at 160 psi at 73 degrees Fahrenheit - Type B PEX is made using the silane method (water bath).