What is the purpose of using test plugs during drainage system tests?

• A. To help with water heating
• B. To temporarily block openings for leak testing
• C. To enhance water flow
• D. To prevent backflow

Answer: (B)

Using test plugs during drainage system tests serves the critical function of temporarily blocking openings to facilitate leak testing. When evaluating drainage systems, it is essential to ensure that there are no leaks that could compromise the system's integrity and performance. By inserting test plugs into various openings, inspectors can effectively create a sealed environment, allowing for pressure or water testing to ascertain whether there are any leaks present. This method enables a thorough and accurate assessment of the system's reliability before it is fully operational.

In this context, the other options do not align with the primary purpose of test plugs. For instance, enhancing water flow, preventing backflow, or assisting with water heating are unrelated to the specific function of ensuring the drainage system can hold water adequately without leaking. By focusing on leak tests through the use of test plugs, inspectors can ensure that the plumbing system is sound and functioning as intended.