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VEVOR 200ft 1/2 Oxygen Barrier PEX tubing 100ft RED and 100ft BLUE Pipe Pex-B 617401141807 | eBay
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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