This sale includesOne roll of 300' 3/4" Pex-Al-Pex tubingThis tubing is primarily used in radiant heat applications along with other heating applications.Pex-Al-Pex tubing is different than regular PEX tubing.Pex-Al-Pex tubing is constructed with a layer of aluminum in between two layers of PEX and as a result is a 100% oxygen barrier tubing.While PEX has UV resistance, it should not be placed in the sun or have UV exposure.Example radiant heating installationsThick/Thin concrete slabsUnder sub-floor (between joist) with or without heat platesEngineered FloorStaple up or Staple downBaseboard and RadiatorSnow Melting SystemsSolar Heating ApplicationsCompatible with the following fitting typesPex-Al-Pex Compression FittingsPex-Al-Pex Press FittingsDoes NOT work with regular PEX fittingsCertifications/Ratings/ApprovalsASTM F1281 StandardSpecificationsNominal Size: 3/4"Inside Diameter: .787"Outside Diameter: .984"PSI RATINGS125 PSI at 180F