Shutgun - Activated Fire Sprinkler Shut-Off Tool Designed to shut off activated fire sprinkler heads instantly. Incorporates a fusible link that will release if a fire rekindles. One hand activation makes it safe and easy to use. Universal Sprinkler Stop for pendant and upright sprinkler heads. The water damage from fire sprinklers can sometimes cause more property damage than the fire they extinguished. Shutgun gives firemen and maintenance personnel the ability to minimize water damage from activated fire sprinklers.