What shape is the operating nut on a dry barrel hydrant typically?

The operating nut on a dry barrel hydrant is typically shaped like a pentagon. This design is intentional, as a five-sided nut allows for better grip and easier operation with specific tools, such as wrench heads that match this unique shape. The pentagonal configuration helps to prevent tampering and provides a secure method of opening and closing the hydrant. This is particularly important in emergency situations where quick access to the water supply is necessary.

Other shapes, such as round or square, are less common for this purpose; while hexagonal nuts do exist in some applications, the pentagonal design has become the standard for dry barrel hydrants due to its balance between security and functionality. This standard helps ensure consistency across hydrant operations in various municipalities, promoting efficiency and safety in water distribution systems.