What is the function of a backflow preventer in a pesticide spray setup?

• A. It protects the water source by automatically closing if water pressure drops or is lost while filling the spray tank.
• B. It increases filling speed by allowing direct water flow into the tank.
• C. It dose calibrates pesticide concentrations automatically.
• D. It prevents spills by locking the lid during filling.

Answer: (A)

Backflow prevention protects your water source from contamination when you fill a spray tank. A backflow preventer on the fill line acts like a one-way valve: if water pressure on the supply side drops or is lost, the device automatically closes to block any liquid from moving backward into the water source. This stops pesticide or cleaning solutions from siphoning back into the drinking water or irrigation system, keeping the source clean and safe. That’s why the function described is to automatically close to prevent backflow during filling. The other options describe things like speeding up filling, automatically dosing concentrations, or locking a lid—functions that aren’t performed by a backflow preventer.