What type of connection does a pipe union provide?

A pipe union provides a rotatable connection, which allows for the two ends of the pipes to be joined together securely while also enabling them to rotate relative to each other. This design is particularly useful in plumbing and piping systems where maintenance or disassembly is required, as it allows for easier access to different sections of the pipeline without the need to cut or unscrew pipes. The ability to rotate helps align the pipe union with other connected components and facilitates adjustments during installation or repairs.

In contrast, a fixed connection would not allow for any rotational movement, and a permanent connection typically refers to joints that are designed to remain intact without the option for disassembly. A compressible connection often pertains to flexible connections, which are not characteristic of the design and function of a pipe union.