Constructed with the exclusive PVC double helix for superior flexibility abrasion resistance and low coefficient of friction for ease of maneuverability. Lightweight in construction Infinityâ„¢ HD (Heavy Duty) is designed for higher working pressure applications (150 PSI). It is suitable in gravity flow or medium suction at ambient temperature. Designed to transfer biodiesel and ethanol blends gasoline and other petroleum products with an aromatic content of 60% or less.