Backflow Prevention Practice Exam

A spool is used to connect a ____?

1. Copper and ductile iron pipe

2. Copper and PVC pipe

3. Disc retainer and valve guide

4. Potable and non-potable system

The correct answer is: Potable and non-potable system

A spool is a fitting used to connect two different types of piping systems. In the context of backflow prevention and plumbing systems, it plays a vital role when linking potable (drinking water) systems with non-potable systems (such as irrigation or wastewater). This connection requires careful consideration and appropriate devices to prevent any risk of contamination of the potable water supply from non-potable sources. The use of a spool in this scenario ensures that the physical and operational separation between the two systems is maintained, which is essential for public health and safety. Understanding the role of spools is crucial when designing or modifying systems where potable and non-potable waters may be in proximity, ensuring proper backflow prevention methods are utilized to mitigate any risks involved. In contrast, while connecting different types of pipes like copper and PVC or ductile iron may require specific fittings, these types of connections do not necessarily address the critical need for preventing backflow between potable and non-potable systems, which is a primary focus of backflow prevention practices.