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Depends in theory if the pipes are exposed to the outside air it may only take upper twenties to freeze the water inside. The higher the pressure in the pipe will add a little protection, but not much. I'd say just take your fingers and put them up to your teeth and chew...and pray they don't bust as it is quite a pain to fix in the cold.
I'm sure you will be fine as most homes (other than moble homes) are pretty well insulated even in the crawl space.
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2SS RS Rally Yellow, LS3, M6, sunroof, extra on the fast!

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