A vacuum breaker is a plumbing device that prevents backflow by stopping contaminated water from siphoning into a clean water supply.

A vacuum breaker is a backflow prevention device designed to protect potable water systems from contamination caused by back-siphonage. It works by allowing air to enter a plumbing line when negative pressure occurs, breaking the vacuum that could otherwise draw contaminated water back into the clean water supply.

Vacuum breakers are commonly installed on plumbing fixtures and systems where there is a risk of backflow, such as hose bibbs, irrigation systems, flush valves, and commercial equipment connections. They are typically simple mechanical devices with few moving parts, making them reliable and cost-effective for both residential and commercial construction applications.

From a code and compliance perspective, vacuum breakers are often required by plumbing codes to safeguard public water systems. Proper installation height, orientation, and accessibility are critical to ensure effective operation and inspection. Regular maintenance and testing help verify that the device continues to provide adequate backflow protection over time.

The widespread use of vacuum breakers became standard after early public health studies linked back-siphonage to waterborne disease outbreaks in urban plumbing systems.

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