It was just pressed in. No reason for it to come loose unless someone was climbing around back there and kicked it.You could glue the metal part, I suppose. The rubber hose originally hung down near the right rear tire and the paranoid among us worried about blowing tranny lube under the tire and sliding, so they re-rout the hose in all sorts of directions. But to get any meaningful lube out of the vent, you'd have to massively overfill the ZF, then drive it hard for an hour or so. I've seen cars with clean ZFs, with no hose at all.
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