That would have saved an old job i was on alot of trouble. There was a three inch copper water main in the Falcons Dome and it was a live line that needed something added to it that wasnt installed with the rest of it. they cut into the copper pipe unsure if it was live, and sure enough, it was. It flooded a good portion of the building before they could shut off the main. Costed the contractor alot of money to fix all the new, almost finished building