I had the same problem two years ago. Tiffin used a not so flexible white hose for the drain (if sink is in slide-out). They have a replacement available. I chose to go to a home improvement store, found some flex hose and fixed it. The hose will run at angle to the rear.
2011 Phaeton 40 QTH Kitchen Sink Drain Leak
in Type A motorhomes
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I had the same problem two years ago. Tiffin used a not so flexible white hose for the drain (if sink is in slide-out). They have a replacement available. I chose to go to a home improvement store, found some flex hose and fixed it. The hose will run at angle to the rear.