The hose which goes up to the frame helps keep water out if you happen to go through deep water.
We had to install lines from the vent fitting on the axle housing up to the upper part of the firewall on a few fleets of trucks(per company request)
Couldn`t hurt to add a little length Tony M grin

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!