Hydrant Guard is an easily installed above grade valve attachment that prevents sheared fire hydrants from releasing water surges. A sheared (broken) fire hydrant can spew thousands of gallons of water per minute onto roads, sidewalks and buildings. Incidents like this are very common, occurring mainly due to automobile accidents. With a minimal effect on actual hydrant operation, Hydrant Guard goes unnoticed until its needed. As soon as a hydrant is sheared, Hydrant Guard springs into action. Its valves immediately close, effectively sealing the water supply and significantly reducing water loss, leaving only a witness stream as a signal.