Helix Racing Products 5/16 x .473 Transparent Polyurethane High Pressure Tubing, 3 ft. roll. Helix High Pressure Tubing is a premium polyurethane , 85 durometer, which provides for superior abrasion, kink, tear, oxidation and chemical resistance. This tubing is very strong with a nylon inner band yet stays flexible. Please select color from the drop down menu. 3 Foot Roll Please Select Color From Drop Down Menu200 PSIInner Diameter: 5/16″ Outer Diameter: .473″ Melting Temperature: 370° F Operating Temperature: 75°-155° F 85 Durometer Do Not Use with Fuel Containing More Than 10% Alcohol Made in U.S.A.