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I have an Everest 5th wheel and didn't realize that there was a holding tank for the kitchen sink, I bought it used and the previous owner didn't mention it to me. Anyway since I didn't drain it after using the sink for awhile it backed up into the sink and wouldn't drain. I finally found the handle for the tank sorta under the slide out and pulled it and then it was Ok after that. So it will back up through the lines until they are full and the sink won't drain. Perhaps you have the same setup.
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