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You might try calling Thor with your Vin number, do not know if they keep the info for a 2014. My 29.3 waste valves are in a drivers side cabinet. Each tank has its own valve, the black pipe is a larger diameter then the Grey. Each valve has a pull handle that opens the "knife type" gate valve. Hook up your sewer hose and let it rip.
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Retired and never looked back
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