Forney 48571 Super Sil-Flo Brazing Rod, 1/8" x 20"Ideal for large and small copper tubing installations. Self fluxing on copper. Typical applications include: refrigeration control valves (copper and brass), joining copper wires to rotor bars, electrical connections, radiant heating systems, air conditioning units, hot and cold water lines, and heat exchanges. T joints, swage joints and sleeves, couplings on return bends and condenser fittings. Sil flo is not recommended for ferrous metals such as