If an inline system has no reservoir, then 0 degrees water is probably okay... even a bit under. It is hard for water to freeze if it is constantly flowing (note the rivers in Colorado and stuff). A few drops of anti-freeze should make it all good though.
-Kev
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I used to throw hot coffee all over the ass of the horse there, then whip him while he was kickin' at me. Those f***in things are crazy.
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