Cross Connection Practice Exam

What can be installed immediately upstream of a backflow prevention assembly to protect it from foreign particles?

1. A Pressure Regulator

2. A Strainer with Blow Out Tapping

3. A Check Valve

4. An Air Gap

The correct answer is: A Strainer with Blow Out Tapping

A strainer with blow-out tapping is designed specifically to filter out foreign particles from the water supply before it reaches a backflow prevention assembly. The primary function of this device is to remove debris and sediment that may enter the water supply system, ensuring that the backflow prevention assembly functions effectively without interference. This is particularly important because contaminants or materials can impair the performance of the assembly, leading to the potential failure of the backflow protection measures. The blow-out tapping feature allows for easy removal of collected particles without the need to disassemble the entire strainer. Regular maintenance can be conducted to ensure that the strainer remains clean and functioning, thus extending the lifespan and reliability of the backflow prevention assembly. In contrast, a pressure regulator primarily adjusts and maintains water pressure, but it does not filter or protect against particulate contamination. A check valve is designed to prevent backflow rather than actively filtering out particles, thus it would not serve the protective function needed upstream of the assembly. An air gap is a physical separation that prevents backflow by creating a gap between the water supply and a potential contaminant, but it does not protect the assembly from foreign particles. Therefore, the strainer with blow-out tapping is the most suitable choice for keeping the assembly free from