Urine freezes at about -5 Celsius, 23 degrees Fahrenheit. Since it's the expanding of liquid that causes pipes to break, I would think any liquid that may freeze would have to room to expand up into the tank rather than straight out sideways.
RV antifreeze is pretty cheap, I can get it on sale for <$5 a gallon. In that case, better to be safe than sorry....
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Donna D.
Ten Forward - 2014 Escape 5.0 TA
Double Yolk - 1988 16' Scamp Deluxe
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