Size: 1/8"-4" threaded 

A male x female threaded union has two threaded ends. One is male end, the other one is female enc. It is a type of fitting used to connect two pieces of pipe or tubing with male and female two different threaded ends. The male end has external threads to connect the pipe with female end, while the female end has internal threads that screw onto the male end of pipe to create a secure connection. This type of union allows for easy disassembly and reassembly of the pipes or tubing for maintenance or repairs.