[holmesaw]

Nope, thats the way it is. Pretty dumb but no fitting I have found will go thru that hole. Most just open the door and don't use that hole. I made a connector with the curved pipe that goes into the campground sewer pipe.
Attached it to the inside of that hole with a threaded piece normally used in toilet that I found in surplus store. Works ok. Heres hoping I don't drag it off somewhere.