This is the swivel mechanism for the high pressure air at the center of my Campbell Hausfeld automatic retracting air hose reel. That hose is crimped directly on the swivel mechanism instead of adding negligible cost with a threaded fitting.
The upshot is that the hose is not replaceable by itself if damaged. And of course parts are not readily available. Throw out the whole thing instead and buy something new. Assholes.
That's replaceable, you just need a crimper. Much harder will be finding the fitting to replace it. I bet they'll sell you the whole hose with a crimped fitting attached. Then you can put a normal end on the old hose and have a spare.
This is quite low on the planned obsolescence conspiracy scale.
I've fixed these with the fittings from a torch hose repair kit.