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Steel fittings are used in connecting, changing the direction, branching, reducing, or enlarging the pipe size in piping systems. Malleable black steel fittings are used to join black pipings together for a seamless flow. Galvanized steel fittings, on the other hand, have a zinc coating to improve rust prevention. Steel fittings are used in various industries to transport and process gases or liquids. They are commonly found in plumbing, manufacturing, petroleum, and chemical industries.