City fill and Winnebago parts? M-Series 2326RK travel trailer

[IAcamper319]

Two questions on my Winnebago Series M 2326RK travel trailer:
1) Can anyone identify this part? It was on the hose just inside the city water fill inlet. I think it may be a check valve or a pressure regulator but am not sure. I think I part of it may have broken off, but again, not sure.
2) Anyone have a good, comprehensive source for Winnebago trailer parts like this one. I didn't find it on E Trailer.com.

 

[Morich]

No real experience with that part and we get little to no help for trailers parts, so a guess is as close as I get?
Looks pretty much mike the standard issue ftting to go on a tube to attach to some item like a fuacet? But there looks to be some form of flat washer tye material inside. Does that make it a part ot stopper off a extra part on something like a manifold?
Is the black uneven ridge some form of adhexive to keep two part togther?
I might first guess it is an extra that was dropped and not recovered!

 

[IAcamper319]

The part was attached just inside the city water fill on the inside of the camper. There was a hose attached, and it looks like the part that attached to the hose has broke off. The part inside there is either a check valve or a regulator — I’m not sure which.

I have replaced it with an inline check valve for now, and everything is working. But I’d love to replace it with the exact same part.

 

[Morich]

Okay. That leaves it an unknown part with unknown use when we have no online info to look for better ideas?? But if there is another part that has broken off and this was not screwed on anything, it must not have been doing much!
Too many mysteries and not enough info to know.