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: .1875 or 3/16"Outside Diameter: .25" or 1/4"FEP Liner Thickness: .010"Max Pressure: 80 PSI at 70°FOperating Temp. Range: -25°F to 180°F