Which material is primarily used in the construction of backflow prevention devices?

Brass is primarily used in the construction of backflow prevention devices due to its favorable properties, such as resistance to corrosion, strength, and malleability. The durability provided by brass makes it suitable for use in plumbing systems where backflow prevention is essential to maintain water safety and quality. Brass can withstand the pressure and temperature changes typically encountered in plumbing applications, ensuring reliable performance over time.

While other materials like plastic and stainless steel can be utilized in specific circumstances or for different components, brass remains the most common choice for the fabrication of the main body and internal parts of backflow prevention devices. This choice is based on its performance characteristics and the need to prevent contaminants from entering the potable water supply, which is critical for public health and safety.