Pipe adapters are very similar to Hex Bushings in that they feature both a female thread and a male thread. The difference is Hex Bushings are used to reduce the size of the pipe line and and Pipe Adapters are used when connecting two pipes of different types.
Hex Bushings
Hex Bushings
Hex bushings are used to reduce the size of female threads from a larger to a smaller diameter. Hex Bushings are threaded fittings that have male threads on the outside and female threads on the inside with a hex head used to tighten the fitting into the threaded opening.