Originally Posted by gunner
I believe the check valve is the brass fitting fastened to the Bell shaped pressure regulator. I was hoping someone knew for sure. I took the bed apart and banged on the regulator and the brass fitting, that seemed to do the trick since the water stopped coming out of the city water hose inlet. I left the shut-off on the city water hose inlet during our campout just in case but the times I checked by opening the shut-off no water came out. I guess the banging on the regulator must of dislodged anything that was keeping the check valve from closing.
Yes, I think you found it. The check valve on most AS is screwed into the bell shaped pressure regulator, on the input side. It just looks like another brass fitting, maybe two inches long. You might see an arrow on it pointing to the pressure regulator if you are lucky. As was said, if it continues to cause you problems, a second one will not hurt anything, if the original is stuck open.