Which assembly configuration includes two check valves, two shutoff valves, and four test cocks?

The configuration that includes two check valves, two shutoff valves, and four test cocks is the Double Check Valve Assembly. This assembly is designed to prevent backflow in water systems, ensuring that the water supply remains uncontaminated. The two check valves work in tandem to provide redundancy; if one fails, the other can still prevent reverse flow. The inclusion of two shutoff valves allows for easy isolation of the assembly for maintenance or testing, and the four test cocks are used for testing the operation of the check valves and the overall integrity of the assembly.

This configuration is specifically engineered to safeguard potable water by allowing for regular testing, which is essential in maintaining water quality standards mandated by regulations. Other assembly types, such as the Air Gap Assembly or the Reduced Pressure Zone Assembly, serve different purposes and have distinct configurations that do not meet the criteria outlined in the question.