The operating nut on top of a hydrant is ________ sided

• A. Five
• B. Six
• C. Three
• D. Four

Answer: (A)

The operating nut on top of a hydrant is five-sided. This pentagonal shape is chosen so a hydrant wrench can grip the nut securely from multiple angles, giving firefighters good leverage to open or close the valve quickly during emergencies. A wrench designed for a five-sided nut fits snugly on all five flats, reducing slipping and making operation reliable even in cramped or muddy conditions. Other shapes would not match the standard tool used, which is why five sides is the correct answer.