That's one that is not well done in the parts as they do not show any pictures for us to look over. Is this anything you have out and might tank a picture of to give us a chance to look it over?
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Post number 8?
https://www.winnieowners.com/forums/...lp-349894.html
Or as an alternate can you tell us more about that port? Is it a metal looking flap that sticks out some from the wall or is it flatter to the wall and you stick the hose in?
There are some adapters for different hose sizes but how much you need to get of the hose to connect them may be a problem!
I found two different tanks setups on that year and model but depends which floorplan you have. Plumbing drawings are here:
https://www.winnebago.com/Files/File...m/Plumbing.htm
This is one but may not match your RV but the parts are the same on the port!
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Something like this but maybe not the correct one?
So is the port part male and the tube slips over it? Or the other way and the tube fits inside the port?
My idea is that if you can get to the tube well enough, maybe pull it out far enough, then a fitting of some sort added to change the end might be what is needed. In electrical those are called "gender benders"!! Got a size for the tube? Does the small tube need change as well. It vents air out of the tank to make filling work better.
Give us more info and we might go looking for something??
Welcome to the group if nobody has said that yet!!