FEP tubing jacketed with LDPE; FEP liner maintains the purity of the sample; Low permeability; Moisture absorption nearly zero; PFOA Free SpecificationsMaterial: Teflon Lined LDPEFEP Inner Lining / LDPE JacketColor: NaturalInside Diameter: .5" or 1/2"Outside Diameter: .625" or 5/8"FEP Linier Thickness: .010"Max Pressure: 40 PSI at 70°FOperating Temp. Range: -25°F to 180°F