An attachment for the Shutgun that will allow you to shut off the larger 3/4" NPT base fire sprinkler heads. Just slip the attachment onto the jaw of the Shutgun, put the jaws into the opening of the sprinkler head, squeeze the handles and the water is off.
This site is devoted to the Shutgun, fire sprinkler shut off tool for building managers, construction, hotels and other commercial or storage facilities. An activated fire sprinkler head can cost $1,000s in damage, repairs and delays. Shutgun stops water flowing from activated sprinkler heads immediately. One on every floor - in every tool box. Don't get caught without one.