It is a type of connector used in plumbing, piping, and HVAC systems to join two lengths of pipe or tubing. The unique design of a union fitting allows for easy assembly and disassembly, making it a convenient choice for maintenance and repairs.
It typically consists of three parts: two female ends (for connecting to pipes) and a central nut that can be tightened to secure the connection.
They can be made from various materials, including brass, stainless steel, and plastic, depending on the application and environment.