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Backflow prevention devices are specifically designed to control cross-connections between potable (drinking) water systems and non-potable sources, which helps prevent contaminants from entering the drinking water supply. These devices ensure that water can only flow in one direction, thereby protecting the integrity of the water supply from potential contamination.

While airborne contaminants, water pressure, and gas emissions are important considerations in pest control and other environmental health contexts, they are not directly related to the function of backflow prevention devices. Instead, the primary purpose of these devices is to maintain a clear separation between different water sources, thus ensuring public health and safety by preventing the risk of backflow that could lead to contamination.