I have a 2021 seneca 37k i have faced the camper uphill and down hill, tilted the tank in different positions still has about 2 inches of water left in it, called factory they didn't have an answer, best that i can see my drain is on the side of the tank near the bottom, figured that there is plenty of room if it freezes to expand, on my second winter have not had a problem yet, in the spring i dump a sanitizer in the tank to help any type of algae or mold to form, the fill it up with freshwater, been working great so far.
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Dale & Robin
2021 Jayco Seneca 37K
2021 Jeep Wrangler JL
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