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I live in North Dakota, very cold winters. Every outside spigot I've ever seen is a design that has a 2+' drain-back tube. you need a 2' straight shot of pipe into the wall, and when you shut off the spigot it actually drains out 2' (or more depending on the setup) of empty pipe between the outside air and your warm house. We have similar setups for freestanding outdoor spigots, except those usually drain 8' down into the ground, same deal with fire hydrants.
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