Aluminum, known for its corrosion resistance, is lighter than steel or copper. Aluminum pipe fittings and flanges connect with pipe creating a secure, leak-free pipe system. Most aluminum-to-aluminum pipe threads bind together quickly and permanently. These fittings and flanges adapt to indoor and outdoor applications including plumbing, racks and railings, and compressed air systems. Aluminum fittings and flanges are available in a variety of sizes and shapes.