I too replaced my new Thetford with a Dometic 320 and had similar issues as stated. Had to install a shark-bite adapter and then a braided water supply line. To specifically address the cross-threading issue, my supply line would not thread onto the toilet properly so I went back to HD with the old PEX fitting that did thread onto the toilet fitting, and determined that the PEX fitting was a finer thread than the toilet water supply line that I purchased. Spoke with a Tech and he said I needed a supply line for a Faucet which has a finer thread. He was correct. Purchased, installed easily, and working as intended.
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Wayne & Karen
2017 3791RD, MORryde SRE4000 w/ X Factor
2017 Ford F350 Lariat, CC, LB, PSD, DRW, 4WD, Curt Q24
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