Ultra Barrier tubing from EJ Beverage is constructed of a unique compound that provides for an excellent alternative to PVC. Advantages to this unique tubing are: PVC Free and BPA Free - containes no DEHP phthalates or other plasticizers Environmentally friendly production - does not emit dioxins Proven to have no significant impact on taste or flavor Extremely low extractables/leachables High flexibility Remains flexible at lower temperatures Ultra-low permeability Superior Barrier properties Temperature range of -40 to 125 F Sold by the 100 foot roll. 1/4" is used in beer lines that are 10-25' in length. It is also used as gas line when you want a really tight fit, particularly with homebrew quick disconnects. Soak 1/4" line in hot water before atttaching to larger 5/16" fittings. Technical Specifications: 1/2" Outer Diameter. 1/4" line provides .65 lbs of restriction per foot. Ideally pounds of resistance should equal pounds of applied pressure. 1/4" line holds 1/3 of an ounce per foot. PVC Free.