This is one roll of 300' 1-1/4" Oxygen Barrier PEX tubing. This tubing is primarily used in radiant heat applications along with other heating applications. While PEX has UV resistance, it should not be placed in the sun or have UV exposure. This tubing can be used in most radiant heating installations such as:Thick/Thin concrete slabsUnder sub-floor (between joist) with or without heat platesEngineered FloorStaple up or Staple downBaseboard and RadiatorSnow Melting SystemsSolar Heating Applications Compatible with the following fitting types:Push-Fit StyleCrimpCrimp ClampCompressionDoes NOT work with Expansion Fittings or Pex-Al-Pex fittings Certifications/Ratings/Approvals:ASTM F876/F877 StandardSDR-9 Dimension StandardDIN 4726 StandardNominal Size- 1-1/4"Inside Diameter- 1.069"Outside Diameter- 1.375"80 PSI at 200F100 PSI at 180F 25 year Warranty on all PEXworx Tubing