Final answer:
The air gap between the faucet and drain prevents the backflow of contaminated water by creating a physical separation and barrier to cross-contamination.
Step-by-step explanation:
Maintaining an air gap between the faucet and drain is essential to thwart the backflow of contaminated water.
The downward flow of water down the drain induces a suction effect capable of drawing wastewater back into the water supply system.
To counter this threat, the inclusion of an air gap serves as a crucial preventive measure.
The functionality of the air gap is rooted in its creation of a tangible separation between the faucet and drain.
This physical gap guarantees the presence of air between the two components, serving as an effective barrier against cross-contamination.
Consequently, the air gap acts as a formidable deterrent, ensuring that potential pollutants or contaminants are barred from infiltrating the water supply system.
By enforcing this protective measure, the risk of compromising water quality is mitigated, affirming the importance of maintaining a clear separation to safeguard the integrity of the water supply.