During a hydrant flow test, which tool is used to minimize property damage?

• A. Hydrant wrench
• B. Pitot tube
• C. Diffuser
• D. Pipe wrench

Answer: (C)

Discharge control during hydrant flow testing is important because a strong straight jet can cause erosion, splash, and damage to nearby pavement, landscaping, or structures. A diffuser attached to the hydrant outlet spreads the water into a wider, gentler spray, reducing the velocity and energy of the flow as it exits. That energy reduction helps protect property around the test site while you still obtain the needed flow data. The other tools serve different purposes—hydrant wrenches operate caps and valves, a Pitot tube measures velocity pressure for calculating flow, and a pipe wrench tightens fittings—not to limit the discharge’s impact on surroundings.