Union F-M is a pipe connector with one end internally threaded and the other externally threaded. This design allows for greater flexibility in connecting different types of pipes or equipment. It is particularly suitable for systems that require the connection of two different thread standards, such as the transition between external and internal threads, or for connecting to equipment and pipes of different sizes. 

The central Union joint structure eliminates the need to rotate the entire pipe during installation, allowing for quick connection and disassembly. It is very convenient and widely used in situations requiring frequent maintenance or equipment replacement. This connector has excellent sealing, high-pressure resistance, and corrosion resistance, making it suitable for use in petrochemical, hydraulic, natural gas, and other fields, and can meet the requirements of high temperature, high pressure, and a variety of corrosive media.