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Do I have a separate Air Dump valve on Coach with HWH leveling?

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Just curious about how the "Air Dump" system works on Coaches with the HWH air leveling system. 

Does the air dump though the HWH manifold, or is there a separate dump valve? I don't have any wiring diagrams, or air schematic diagrams, showing how the dump system works.

My HWH control panel has a "dump" button - but I also have a separate Air Dump rocker switch next to the HWH panel. Are both switches acting on the same valve (HWH valves)?

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