How long should an atmospheric vacuum breaker not be subjected to use?

An atmospheric vacuum breaker should not be subjected to use for a duration of 12 hours. This timeframe is important to ensure that the device remains effective in its primary function of preventing back-siphonage. When an atmospheric vacuum breaker is taken out of service for a period of 12 hours or more, it may allow contaminants to enter the potable water system if moisture is present or if the device is not functioning properly upon reactivation.

Ensuring a 12-hour period without use helps maintain the integrity and reliability of the vacuum breaker, which is crucial for health and safety standards in plumbing systems. Regular checks and adherence to this time frame can help prevent potential cross-connection issues that might otherwise lead to water contamination.