I bought this a while back and I am just getting to it, this does not make sense why is there a vent hose in this? It's only on one side:
You can see the hose in the middle that connects to the top:
The hose dumps out the bottom would this have gone through the bed?
Coincidentally the hose side is the most rusted so I am not sure how to go about this, the metal has to be removed and it is held on by the sunk female taps...if I pull those out they may not go back in they are pressed any ideas?