For some reason, my dealer said there wasn't room to install this on my MW 31D when I bought it in Oct 2016.
After 4 years of winterizing using the pump outside, I've decided to get Camco part # 6279 and do it myself. I think it will fit and I'll still be able to get the cover on the access hole after installation.
I had one of these "intake tubes" on my previous MH and it made the winterizing process so much easier.
Found a good you tube video that convinced me to do it myself...
If you're paying a dealer to winterize your unit, I'd encourage you to learn how to do it yourself. It is so convenient to do it myself and 2 less appointments with the dealer each year. "If I can do it , anyone can".