EVABarrier 5 mm ID x 8 mm OD Double Wall Draft Tubing - 39 ft.EVABarrier Double Wall Tubing is the modern standard for high purity draught beverage lines. Featuring a 5 mm internal diameter and an 8 mm OD, this tubing uses a dual layer construction: an outer EVA barrier for flexibility and an inner proprietary polymer for a 100% oxygen barrier and zero flavor absorption. The transparent red color identification is ideal for designating secondary gas lines or specific beverage types in complex draught bundles.