Also directly below the fresh water tank you should see a blue pex tube sticking out of the black poly sheeting. This will be the fresh water tank drain, it to should have a cap on it just as should the two low point (red & blue) pex tube drains. I installed shut off valves on all of mine to make things easier. I hope this helps.
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Scott & Julie
Northern Wisconsin
2021 Cruiser Air 27MK
2021 Ford F-250 XLT Premium
6.2L, 6 3/4 ft bed, FX4. Tow pkg.
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