A stainless steel female thread nipple is a type of pipe fitting that has female threads on both ends. It is typically made of stainless steel, which is known for its corrosion resistance and durability. Female thread nipples are commonly used in plumbing and other industries to connect two pipes or fittings with male threads. They provide a secure and leak-free connection when properly tightened. AND THEY ARE KNOW AS STAINLESS STEEL MACHINERY ADAPTOR