Honestly, I'd say just get a new hookah if you can
If its rusting, the hookah is done. Don't smoke from it anymore unless you want some Tetanus in your lungs!
YAY! for Tetanus!"
Well, what your budget? I'd say get a good, generic egyptian from Caravan Trading Group. You cant pass up the good deals on those hookahs! I'd so buy a 22" 2 hoser, but I pretty much have one already with my Af small + H-S syrian adapter.