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The "nuts" aren't really hex nuts, but little round metal knobs on the front of the shut-off (perpendicular to the shut off handle)... I think they might be for bleeding air out of the line?
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Hi,

I live in the Northeast and for the first time this past winter, I actually used the shutoff valves that lead to my outside water spigots. Now that I've turned them back on, they are leaking...