An extension nipple is a cylindrical plumbing fitting with male threads on both ends. It is used to extend the length of a pipe or to connect two female-threaded components. Extension nipples come in various lengths and diameters, providing versatility in plumbing installations. They are commonly used in scenarios where an additional length of pipe is needed, such as in water supply lines, gas lines, or other piping systems. Extension nipples are typically made of materials like brass, stainless steel, or PVC, ensuring durability and resistance to corrosion. They play a crucial role in achieving precise and secure connections within plumbing networks.