rustystud
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Mine came with one as did many others I've seen and worked on. What I think happened is when the shop mechanics serviced them they would check for fluid leaking and then forget to reinstall them. Left loose the hose would flop around until eventually falling off. I know for a fact that any truck that was set up for any kind of water crossing had vent tubes on all the axles and transmission and transfer-case.I have never see "a length of tubing" on that vent line.
As you said that vent has a flange on it & it will rotate.