When filling with water, most of it dumps out the side.

Dutchmen wrote:

I used an old hose (actually it was new, just sitting around a long time), for a washing machine and cut it in half. Both ends have the female end.

I then attach the 1/2 hose to my fill (garden hose), and simply insert it into the camper fresh water fill. The diameter of the washing machine hose is smaller than the fill hole hose, allowing air to escape around it (and the little vent also). I then never turn the spigot on full blast. I always let it fill slow.