This is an old thread but to the OP it is for the black tank flush and the only reason it shows up there is because it needs to be mounted 6 inches or higher above the toilet and that was a convenient place to do that. The water input should come from the tank flush connection in the service bay. Check out the attached instructions for installing the black tank flush.
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Bob
2022 Quantum JM31
2023 Colorado Z71
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