Copper union is a type of plumbing fitting used to join two lengths of copper pipe while allowing for disassembly of the connection. It consists of three main components: two female threaded ends and a central section that can be unscrewed to disconnect the pipes.

A copper union typically has female threaded ends on both sides. These threads allow for a secure connection to male-threaded pipes or fittings. The central section of the union is the part that can be unscrewed. It acts as a sort of “nut” between the two threaded ends. By unscrewing this central section, the pipes can be easily disconnected. The threaded ends of the union may be designed for sweat or solder connections, depending on the specific plumbing requirements. Sweat connections involve soldering the copper pipes to the union.

Some copper unions have seal rings to provide additional sealing and prevent leaks when the central section is screwed tightly.

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