Pexflow PFR-R34500 Oxygen Barrier Pex tubing, 3/4 Inch, Red Reliable  resistant to cracks, uninterrupted hot water flow, maintenance free, long life expectancy Performance - prevents oxygen and foreign elements from penetrating heating system to help maintain corrosion resistance of metal parts Flexible - ability to bend pipe making it easy to work with the bend radius of 5 feet Markings - PEX tubing markings unique feature imprints common standards and ratings making it easy to understand tubing properties PEX Type: PEX B / Color: 1 x Red / PEX Tubing Size: 3/4 Inch / Coiled: Yes / Total Length: 1 x 500 Feet / Outside Diameter: 0.875 / Inside Diameter: 0.671 Inch / Pressure Ratings: 80psi @ 200F, 100psi @ 180F, 160psi @ 73F