Aluminum Fuel Line Hard Tube is a lightweight, corrosion-resistant, and flexible aluminum alloy (often 1060 or 3003) used for custom plumbing in fuel, transmission, and oil systems. It offers high workability for easy bending, cutting, and flaring without special tools, typically rated for high pressures (up to 650-700 PSI) and compatible with E85, making it popular for automotive, performance, and racing applications.