Which device is a backflow prevention measure mentioned as an option in the cross-connection context?

Which device is a backflow prevention measure mentioned as an option in the cross-connection context?

• A. Reduced pressure zone backflow preventer
• B. Bell Joint Clamp
• C. Cross Connection ORC
• D. Air gap

Answer: (A)

In cross-connection control, backflow prevention is about stopping reverse flow that could pull contaminants into the clean water supply. The device that best fits this role is the reduced pressure zone backflow preventer. It actively blocks backflow by keeping a controlled, reduced pressure between the supply and the protected system. This design uses two check valves plus a relief valve to sense pressure and vent if the downstream pressure rises or upstream pressure drops, preventing contamination from moving back into the line. It’s commonly specified for higher-hazard cross-connections and requires periodic testing to ensure it’s functioning properly. Air gaps also prevent backflow by physically separating the water source from potential contaminants, but they’re not a mechanical device installed in the piping the way RPZs are, and they aren’t always practical in every installation. Bell Joint Clamp isn’t a backflow device at all; it’s a repair/securement tool for joints. Cross Connection ORC refers to the regulatory framework governing cross connections, not a device.

In cross-connection control, backflow prevention is about stopping reverse flow that could pull contaminants into the clean water supply. The device that best fits this role is the reduced pressure zone backflow preventer. It actively blocks backflow by keeping a controlled, reduced pressure between the supply and the protected system. This design uses two check valves plus a relief valve to sense pressure and vent if the downstream pressure rises or upstream pressure drops, preventing contamination from moving back into the line. It’s commonly specified for higher-hazard cross-connections and requires periodic testing to ensure it’s functioning properly.

Air gaps also prevent backflow by physically separating the water source from potential contaminants, but they’re not a mechanical device installed in the piping the way RPZs are, and they aren’t always practical in every installation. Bell Joint Clamp isn’t a backflow device at all; it’s a repair/securement tool for joints. Cross Connection ORC refers to the regulatory framework governing cross connections, not a device.