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Old 10-18-2019, 10:52 AM   #1
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06 Vista Cruiser ...Drain Water tank.. Winterize

God Day all,
We have an o6 sprinter GS Vista Cruiser with a 26 gallon Fresh water tank under the rear bunk.
The tank is kind of a soft somewhat pliable plastic. LIke the ice cube trays.
PROBLEM:
We live in central Ohio where the temps freeze and very likely will bottom below zero this winter.
Draining the water system but there remains at least al inch of water in the tank with no apparent way to completely drain it. I have tried to insert a siphon tube into the water inlet with no success. I do not see an inspection access.
Is there a way to completely drain the house water tank?
IF NOT will the tank weather the freezing temps?
I have a theoretical problem with introducing chemical anti freeze into possible drinking water storage. I understand the need for it in the drain traps.
Please enlighten a rookie here...Good, Bad or Indifferent!
Regards Gary
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Old 10-18-2019, 12:08 PM   #2
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The surface area of the water in the tank means that the pressure it will exert on the sides of the tank is minimal. The water left in a large RV water tank is usually not a bother even if it freezes. For one thing the water can 'pootch' up as it's freezing...like the ice cubes in a plastic ice cube tray (which you may have noticed, hardly every crack).

Now if the tank was full, that would be a disaster and the tank would be ruined if it froze but an empty tank, even with 1" on the bottom should be fine.

Finally, if you're really worried about it, you can drill a 1/2 hole in the top of the tank (assuming you have access) and use a small pump to pump it out. Then use Eternabond sealing tape to cap the hole.
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Old 10-18-2019, 07:02 PM   #3
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You maybe able to adjust tilt/ blocks/ levelers to push water to the drain?
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