The Plumber's Choice 1 in. x 100 ft. PEX A Tubing Oxygen Barrier Pipe for Hydronic Radiant Floor Heating Systems AOBR1100 - The Home Depot
SharkBite 3/4-in x 100-ft Orange PEX-C Pipe With Oxygen-Barrier For Radiant Heating in the PEX Pipe, Fittings & Specialty Tools department at Lowes.com
Riifo BPX3420 3/4" x 20' Oxygen Barrier PEX-B TubIng Straight Length Pipe In Red | AF Supply