Rhode Island Journeyman Plumber Practice Exam

In what scenario is an air break most appropriate?

1. When direct connection is needed

2. For gravity flow systems

3. To prevent backflow

4. For high-pressure systems

The correct answer is: To prevent backflow

An air break is most appropriate in scenarios where backflow prevention is necessary. It serves as a physical separation between the supply of potable water and any potential contaminant source. By providing this separation, an air break helps ensure that, in the event of a negative pressure situation (such as a sudden drop in water flow), contaminated water cannot siphon back into the clean water supply. This function is crucial, especially in plumbing installations where wastewater could potentially backflow into drinking water systems, leading to health hazards. For example, air breaks are frequently found in applications involving sinks, floor drains, and other fixtures where waste could backflow during drainage slowing or other disruptions. The other options do not align with the primary purpose of an air break. While direct connections and high-pressure systems might utilize other mechanisms for safety and reliability, an air break is specifically designed to interrupt potential backflow, making it the most suitable choice in scenarios where contamination of the water supply must be avoided.