Backflow Prevention Practice Exam

Which material is typically used for constructing pressure vacuum breakers?

1. Plastic

2. Aluminum

3. Brass

4. Steel

The correct answer is: Brass

Pressure vacuum breakers are typically constructed using brass due to its durability and resistance to corrosion. Brass is an alloy composed primarily of copper and zinc, which provides strength and enhances the longevity of the device, especially in various environmental conditions and over time as it comes into contact with water. The selection of brass for pressure vacuum breakers also supports their ability to withstand pressure fluctuations and the negative pressure conditions that can occur in a plumbing system. This material ensures a reliable seal and helps prevent backflow while maintaining the functionality of the device. While plastic could also be used in certain valves and fittings, it generally does not offer the same level of durability under pressure and may not perform as effectively in all environmental conditions. Aluminum is lightweight but less common for this application, primarily due to susceptibility to corrosion from water and air over time. Steel, although strong, is also prone to rust and corrosion if not properly treated, making brass a superior choice for the construction of pressure vacuum breakers.