Proflows New U-J mandrel-bent tubing offers up to three bends in one! These U-J tubing bends give you a 180 degree bend, a 45 degree bend, and a straight leg for a great economical option for your fabrication project. Proflow pipes are manufactured in Aluminium or 304 stainless steel that's capable of withstanding acidic, high-heat, and corrosive conditions; and superior aluminized mild steel that's also resistant to harmful corrosion. Whether you're fabricating exhaust, headers, or intercooler pipes, Proflow U-J mandrel-bent tubing make life easy.