m Ransley wrote:

Your city should provide you the service of shutting off the water main
for a day for a small fee. For me its 15$. Or you could buy probably at
HD a main box key, [buffalo box] I would not trust freezing it , the
pressure probably could just blow it out.

There is commercial equipment sold specifically for doing this "ice
plug" repair method so I suspect that the risk of damage is minimal if
done properly. The units I've seen have a small refrigeration unit with
two pipe freezing jacket things connected to it so you can form two ice
plugs, one on each side of the work area and maintain them in a frozen
state as long as necessary.

Pete C.