Why Fire Hydrants Don’t Freeze and Burst During Winter

Why Fire Hydrants Don’t Freeze and Burst During Winter

The fire hydrant that we know today traces its origins back to fire plugs. Water mains that transported fresh water in a city or town used to be made of hollowed out logs buried beneath the streets. Whenever there was a fire and firefighters needed water, they dug up the cobblestone street and drilled a hole into the wooden pipe. After they extinguished the fire, the firefighters put a plug in the hole—called a “fire plug”—before reburying the water main. The plug could then be removed and the same hole used if another fire occurred in the area, saving the drilling time.

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