DRV has used 3 different versions of hte anderson panel that I know off.
Which one do you have - picture.
The newer versions have a check valve on the tank fill line.
The safest simplest fix is a 1/4 turn valve in the the fill line.
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Thanks,
Duane
2019 DRV MS 39DBRS3 ---> Flexible Flyer
2020 F-450
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