Pipe Unions are a type of a fitting designed to unite two pipes of the same size so they can be detached without causing any deformation to the pipes.
Reducing Hex Nipples
Reducing Hex Nipples
Reducing Hex Nipples have male threads on each end that are used to connect two other fittings or pipe of different sizes. These Reducing Hex Nipples feature a hex design in the middle to aid in the installation and disassembly of pipe lines.