What is the purpose of a backflow prevention device in hydrant connections?

• A. To speed up pumping.
• B. To prevent contaminants from entering the water supply.
• C. To measure nozzle pressure.
• D. To increase flow.

Answer: (B)

When hydrant connections are used for pumping, there’s a risk that water from the hoses or pump side could be drawn back into the public water supply if pressure changes or a cross-connection occurs. A backflow prevention device provides a one-way barrier that stops this backward flow, protecting the drinking water from contamination. It doesn’t speed up pumping, measure nozzle pressure, or increase flow; its job is to prevent contamination from flowing back into the supply.