[Guy]

As you know, our coaches were built within a few weeks of each other. Ours is just as Kyle describes. We have one tank with a black water valve and just beyond in series is the grey water valve. if both valves are closed , the grey water goes out to the grey water valve, and since it is closed, it backs up (diverts ) to going into the black water tank throug a diverter line. This results in kitchen and bath drains being very slow. Happy to take and post photos if you like. Our setup is a little different han Clarkes. The good news is all of these fittings are residential with the exception of the valve, and Clarke is an expert in the installation of those