My factory installed Black tank flush on my 2012 Stealth 2714 toyhauler quit working last year. It won't take water when the hose is hooked up on the outside hose point. It's almost as if the line was capped off. When it worked, we could hear the sprinkler head in the black tank, but now.. nothing.
I've looked for the culprit and noticed the check valve unit as I was following the line from the outer hook-up to the tank. The check valve unit isn't leaking but I wonder if maybe its broken and stuck closed. I hope that it's not the problem because it's tucked up high behind the sink and will be nearly impossible to get to with removing my kitchen counter top. For what it's worth, mine appears to be a JR Products vacuum breaker / check valve as I matched pictures I found on Google.
My only other thought was that the sprinkler head itself is broken. I thought it might be clogged with TP but we never even get close to filling the black tank. And I ruled out the TP clog also because the line doesn't accept any water at all. As I said, it's like it's completely sealed or capped.
Any thoughts or suggestions would be greatly appreciated.