Can you tell us a bit more about the problem and which RV you have?
No expert on the flushing systems but it seems kind of hard to think it would stop up at the nozzle. Seems like water pressure would blow it off?
But then you know more about what you see!
What my line of thought is that there is a gizmo called a vacuum breaker and that seems like it might be more likely to jam and cut flow, if that is what you are seeing?
My thought goes that the vacuum breaker may be stuck to cut water flow and it may/may not be a much easier thing to check. But they are in different locations on different floorplans of the 2014 Meridian.
If you can tell us which RV, we may be able to pull up drawings to let you give that vacuum breaker a look?
This is where it is on the 40U model but may not be true on your RV, so just looking for an easier way to start!
Parts drawings are here if you would rather go direct:
https://catalog.winnebagoind.com/menu/Parts.htm
You may know a totally different part of the story but I thought to mention this idea?