The spring behind the fusible link may require replacement if the Fusible Link releases due to the heat of a fire. Mechanical damage to the fusible link may also cause the spring to require replacement.
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.