Recommended or use in hydraulic brake, power steering, fuel lines and transmission cooler lines. Inverted flare fittings are inexpensive and reusable. Inverted flare provides excellent vibration resistance. Seats and threads are internal and protected. Short nut (available in brass or steel) allows very close tube bends. Working pressure: up to 2,000 psi depending on tube size. Temperature range: -65°F to +250°F at maximum operating pressures.