2021 228 bhse ???

[Tcris3]

Hi, first off I just joined the forum and I see a ton of great info on here!
I am having 2 issue with our new pop up, first off there is always a large gap where the door meets the top of the camper, so much so that the little tabs pulled out, I can fit my whole hand in there, I can pull them together and the whole roof shifts to fill the gap but then right back to where it was…is there something wrong?

Also I looked into the check valve and tried the reseat trick but I still have city water filling up the tank, is there a good aftermarket solution to stop this for good?

[Capacitor]

Shurflo has an inline check valve. Search Amazon then buy elsewhere.