Hex nipples come in handy during applications that require you to connect two brass or steel pipes, both with female ends. Common applications involve automotive, plumbing, or industrial.
In cases where you can spare a little space between threaded ends, you can use a “hexagonal nipple”, which has a hexagonal section in the middle. It functions like a nut that can be gripped by a normal wrench, providing a greater mechanical advantage than normal rounded pipe.
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