To prevent backflow when installing a kitchen sink, which is required?

To prevent backflow when installing a kitchen sink, which is required?

• A. An air gap between the faucet and flood rim of the sink
• B. A cross-connection
• C. A link between the potable water and contaminated water
• D. A hose with a nozzle

Answer: (A)

Backflow prevention relies on creating a physical separation between the potable water supply and any potential source of contaminated water. An air gap provides that separation by leaving a space that wastewater cannot cross, so changes in pressure or a drain surge cannot pull contaminated water back into the supply. In a kitchen sink, the required safeguard is an air gap installed between the faucet and the flood rim to ensure this barrier remains intact. The other options describe risky conditions or do not address backflow, so they do not provide the necessary protection.

Backflow prevention relies on creating a physical separation between the potable water supply and any potential source of contaminated water. An air gap provides that separation by leaving a space that wastewater cannot cross, so changes in pressure or a drain surge cannot pull contaminated water back into the supply. In a kitchen sink, the required safeguard is an air gap installed between the faucet and the flood rim to ensure this barrier remains intact. The other options describe risky conditions or do not address backflow, so they do not provide the necessary protection.