Aeroflow Performance zinc coated steel hard lines are an economical alternative that gives you a high-quality finish at a fraction of the price. This steel brake/fuel/oil line is ideal for routing lines along the chassis, frame rails or anywhere flexible line is not required. These steel hard lines are rated for up to 6000 psi and designed for use with tube line adapter fittings or when using a flaring tool with tube nut/tube sleeve combinations.