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: .375" or 3/8"Outside Diameter: .5" or 1/2"FEP Liner Thickness: .010"Max Pressure: 50 PSI at 70°FOperating Temp. Range: -25°F to 180°F