One thing they mention on the Montana Factory Tour on YouTube, is to raise the front of your rig to get a better flush. I do this when I can and at the end of our road trip to get a better flush. The bathroom grey tank drain s better too.
For the galley grey tank I lower the front down. This tank drains the opposite way.
Experiment with your rig, up, down, left, right.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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