Wood Destroying Organism (WDO) Home Inspection Practice Exam

The appropriate device to be attached to the end of a hose when filling pesticide tanks is a backflow preventer. This crucial component is designed to protect the water supply from contamination that can occur if there is a loss of pressure in the system. When pesticide tanks are filled through a hose, there is a risk that contaminated water can siphon back into the clean water supply due to the difference in pressure.

A backflow preventer creates a physical barrier that allows water to flow in one direction only, thus preventing any backflow of liquids that may contain harmful pesticides or chemicals. Its installation is critical in maintaining safe drinking water standards and preventing environmental pollution.

Other devices listed, such as an aerator, clamp, or spray nozzle, serve different functions that do not directly address the need for preventing backflow. An aerator is used to introduce air into the water to reduce pressure and improve flow but does not prevent backflow. Similarly, a clamp is primarily used for securing hoses or pipes but does not serve to protect the water supply. A spray nozzle is designed to control the application of liquid but lacks the necessary features to prevent backflow.