Final Answer:
72 To prevent backflow, a sink must be equipped with Air gap,So, the corret option is A.
Step-by-step explanation:
To prevent backflow in a sink, it must be equipped with an air gap. An air gap is a physical separation between the water outlet and the receiving vessel, ensuring that contaminated water cannot flow back into the clean water supply. This is achieved by creating an unobstructed space, typically in the form of an opening, between the outlet and the flood level rim of the fixture. The height of the air gap is crucial to its effectiveness, and it is designed based on plumbing codes and regulations to maintain a safe and hygienic separation.
The air gap serves as a barrier that prevents cross-contamination between the sink and the potable water supply. When water flows out of the sink, the air gap provides a break in the plumbing system, ensuring that any potential contaminants, such as bacteria or debris, cannot flow back into the water supply. This mechanism is a fundamental aspect of plumbing design, safeguarding public health by maintaining the integrity of the water distribution system. Plumbing codes often dictate specific requirements for the height and design of air gaps to ensure their efficacy in preventing backflow.
In summary, the choice of an air gap as the solution to prevent backflow in a sink is based on its proven effectiveness in creating a reliable separation between the sink's wastewater and the clean water supply. This ensures compliance with plumbing standards and regulations, providing a robust and hygienic solution to the potential risks associated with backflow in plumbing systems,Thus, the correct option is A.