Rhode Island Journeyman Plumber Practice Exam

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The critical level of an atmospheric vacuum breaker must be installed a minimum of how many inches above the flood level rim of the fixture or device?

1 inch
1 1/4 inches
1 1/2 inches
2 inches

The correct answer is: 1 1/4 inches

The correct requirement for the installation of an atmospheric vacuum breaker specifies that it must be positioned at least 1 1/4 inches above the flood level rim of the fixture or device. This measurement is crucial for ensuring proper operation and maintaining backflow prevention standards. By maintaining this specified distance, you help prevent potential back siphonage, which could allow contaminated water to enter the potable water supply. This height ensures that if the water level in the fixture rises due to backflow, it will not reach the vacuum breaker, thereby maintaining the integrity of the plumbing system. While some may consider other distances appropriate, the 1 1/4-inch standard aligns with codes and regulations designed to protect public health and safety by minimizing the risk of contamination.