{"product_id":"legend-valve-850-143-legendflex-pex-tube-with-oxygen-barrier-5-8-inches-300-foot-coil","title":"Legend Valve 850-143 Legendflex Pex Tube with Oxygen Barrier 5\/8 Inches 300 Foot Coil","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe Legend Valve 850-143 is a 5\/8 inches LEGENDFlex PEX tubing with an integrated oxygen barrier, supplied in a 300-foot coil. This product is designed for hydronic heating systems, radiant floor heating, and closed-loop plumbing applications where oxygen intrusion must be prevented. Plumbers, pipefitters, and hydronic system installers rely on oxygen barrier PEX tubing to protect ferrous components such as boilers, pumps, manifolds, and cast iron fittings from corrosion caused by dissolved oxygen in the water. The oxygen barrier layer in the 850-143 is bonded directly to the exterior of the tube, meeting DIN 4726 standards for oxygen diffusion, which keeps system integrity intact over the long service life of the installation. LEGENDFlex PEX tubing is manufactured to ASTM F876 and ASTM F877 standards, confirming it meets the dimensional and performance requirements expected by professional installers. PEX tubing at the 5\/8 inches diameter is a common choice for radiant heating loops, offering a balance between flow rate capacity and flexibility that makes routing through floors, walls, and tight spaces straightforward. The 300-foot coil format reduces the need for couplings and fittings on longer runs, which lowers both labor time and potential leak points. This tube handles working pressures up to 100 PSI at 180 degrees Fahrenheit, making it well suited for hot water hydronic circuits. Legend Valve is a recognized name in the plumbing and hydronic industry, known for producing reliable flow control and distribution products. The 850-143 fits standard PEX fittings and is compatible with crimp, clamp, and expansion connection methods depending on the fitting type used. Whether used in new construction or retrofit hydronic installations, this oxygen barrier PEX coil delivers the performance and convenience trade professionals expect on the job.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIntegrated oxygen barrier layer prevents dissolved oxygen from entering the system, protecting metal components from corrosion\u003c\/li\u003e\n\u003cli\u003e5\/8 inches diameter in a 300-foot coil reduces coupling count on long radiant or hydronic loop runs\u003c\/li\u003e\n\u003cli\u003eRated for up to 100 PSI at 180 degrees Fahrenheit, suitable for residential and light commercial hydronic heating systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\u003cp\u003eThe Legend Valve 850-143 LEGENDFlex PEX tube with oxygen barrier delivers reliable corrosion protection and flexibility for radiant floor heating and hydronic systems. The 300-foot coil length and 5\/8 inches diameter make it a practical choice for professional installers on mid to large scale loop installations.\u003c\/p\u003e\u003ch3\u003eProduct Information\u003c\/h3\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: LEGEND VALVE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 850-143\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTube Diameter\u003c\/strong\u003e: 5\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoil Length\u003c\/strong\u003e: 300 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTube Type\u003c\/strong\u003e: PEX with Oxygen Barrier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Hydronic heating, radiant floor heating, closed-loop systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOxygen Barrier Standard\u003c\/strong\u003e: DIN 4726\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction Standard\u003c\/strong\u003e: ASTM F876, ASTM F877\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Working Pressure\u003c\/strong\u003e: 100 PSI at 180 degrees Fahrenheit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Connection Methods\u003c\/strong\u003e: Crimp, clamp, expansion\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LEGEND VALVE","offers":[{"title":"Default Title","offer_id":51120848830770,"sku":"850-143","price":314.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/304883906.png?v=1777741336","url":"https:\/\/voomisupply.com\/products\/legend-valve-850-143-legendflex-pex-tube-with-oxygen-barrier-5-8-inches-300-foot-coil","provider":"Voomi Supply","version":"1.0","type":"link"}