Helix Racing Products 1/8 x 1/4 Transparent Polyurethane Carburetor Vent Line, sold in 25 ft. roll. Helix Vent Line is a premium polyurethane , 85 durometer, which provides for superior abrasion, kink, tear, oxidation and chemical resistance. Please select color option from drop down menu. Sold in 25 ft. Roll Please Select Color From Drop Down Menu Inner Diameter: 1/8″ Outer Diameter: 1/4″ 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.