Galvanized steel fittings have robust zinc coating, which makes them super durable, tough, and corrosion-resistant. Steel fittings with a galvanized zinc coating boast robust design properties that resist the detrimental effects of humidity and exterior elements. They’re used in residential water supply lines and industrial gas pipelines. Galvanized steel fittings come in multiple shapes and types, including unions, elbows, tees, and cored plugs.