What is the main purpose of a vacuum breaker?

The main purpose of a vacuum breaker is to prevent backflow in plumbing systems. Backflow occurs when there is a reversal of the normal flow of water, which can lead to contamination of the potable water supply. A vacuum breaker operates by allowing air into the system when a negative pressure occurs, thus breaking the vacuum that could cause backflow. This mechanism ensures that potentially harmful contaminants do not siphon back into the clean water supply, maintaining the safety and integrity of the drinking water.

By effectively preventing backflow, vacuum breakers protect public health and comply with plumbing codes and regulations designed to safeguard potable water systems.