Transparent green, polyurethane vent line, premium polyurethane, 85-Durometer. Has superior resistance to kinking, abrasion, tearing, oxidation and chemical damage. Very flexible with tight bend radius, this fuel line will not get hard over time and stays flexible within a wide range of working Temperature, -75 Degree Fahrenheit, to 175 Degree Fahrenheit. Melting Temperature 370 Degree Fahrenheit. When replacing tubing or hose it is always a good idea to use clamps even on gravity feed systems.