This would sure make replacing the toilet easier. I'm surprised Trail Manor is not building the new models this way. Seems like an easy way to connect the two would be to tie the black water discharge pipe to the grey water discharge pipe. I'd use a T with a 45 instead of a 90 so that the water from the toilet flows towards the tank to hopefully keep it from clogging there. Would probably need a cutoff or flapper to keep the water from back flowing towards the toilet when emptying the gray water tank.
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