Stainless steel tees are a type of stainless steel pipe fitting, primarily used at the junction of the main and branch pipelines. They come in two types: equal diameter tees and unequal diameter tees. Three tees with the same diameter are known as equal diameter tees, while those with different diameters are called unequal diameter tees. Stainless steel tees offer excellent corrosion resistance, making them frequently used in petrochemical industries, among others.