Why doesn't the property suggest changing the fire sprinkler?

This is because the sprinkler needs to be temporarily stopped and drained. If this nozzle needs to be replaced, the signal valve in this area should be closed, and the water should be tested and discharged from the drain valve and terminal. After replacement, it needs to be filled with water to check whether there is water leakage. There are also relatively many requirements for the change of the nozzle. It is easy to make mistakes, which will lead to unqualified fire inspection.