Quote:
Originally Posted by cavie
No need for anything in the black tank. Just empty it. If there is something in it there is plenty of room for expansion and nothing to break. Well except for a log or two.
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In the tank maybe, but depending on how the drain is configured you may be in danger of cracking the exit piping. Remember, freezing liquids expand in ALL directions. Do you really want to chance having to make a repair on the black tank drain piping?