Stainless steel tees are a type of stainless steel pipe fitting, primarily used at the junctions of main and branch pipes in pipelines. They come in two types: equal-diameter tees and unequal-diameter tees, where three tees with the same diameter are called equal-diameter tees, and those with different diameters are known as unequal-diameter tees. Stainless steel tees offer excellent corrosion resistance, making them commonly used in the petrochemical industry and other sectors.