Which statement about the largest hydrant nozzle is correct?

• A. To attach a discharge hose from the hydrant
• B. To vent air from the system
• C. To drain the hydrant's water
• D. To connect the pumper suction hose

Answer: (D)

The largest hydrant nozzle is the pumper suction connection. A pumping engine needs to draw water from the hydrant, so the suction hose is attached to the largest opening to allow a high-volume, low-restriction intake into the pump. Discharge hoses for attack lines use smaller outlets, venting air is done through other fittings, and draining water uses the hydrant’s drain or other paths—not the largest inlet. So connecting the pumper suction hose to the largest hydrant nozzle is the correct statement.