US Forge 03051 4-Ounce Liquid Flux Liquid flux is used with solid wire solder Made for non electrical soldering of copper, brass, galvanized iron and steel Also used for nickel alloys and nickel/tin plate Completely water washable; excellent for easy clean up Bottle contains 4 ounce fluid Liquid flux for non electrical soldering of copper, brass, galvanized iron, steel, nickel alloys and nickel/tin plate Used with solid wire solder Completely water washable Excellent for easy clean up Bottle contains 4 ounce fluid