Back in the early days before metal, copper or plastic was used as water pipes, hollow logs were used to carry water. When there was a fire, the fire department would find and dig down to the log, use an auger to drill a hole in it and pump water out of the pipe onto the fire. After the fire was extinguished, they would drive a wooden plug into the hole and rebury the log. They would mark the location of this ‘fire plug’ so they did not have to drill another hole in the log for the next fire. Thus, today fire hydrants are still often called fire plugs.
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