Thanks for the suggestions. The problem with what Keystone did was the sandwiched the gray and black valves between the tanks and there's no play to remove either valve. I found a video on youtube where someone ran into this exact problem and ended up having to cut some of the PVC on the grey side to give him room to get the valves out. I think I actually found his post in this forum as well. I think I'm just going to put everything back together and install the Valterra Twist on Waste Valve a neighbor mentioned. It will save me time in the long run.
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