After addressing a leaking discharge coupling, what is a recommended first step?

• A. Tighten only by hand and proceed.
• B. Apply thread sealant without inspection.
• C. Replace entire discharge assembly.
• D. Stop water flow if needed, tighten or replace the coupling, inspect gasket or threads, and retest the connection.

Answer: (D)

When a discharge coupling leaks, the safest and most effective first move is to control the system and verify the seal step by step. Stop the water flow if needed to safely inspect, then tighten the coupling or replace it as required. After addressing the connection, inspect the gasket and the threads for damage, wear, or cross‑threading, and address any issues you find. Finally, retest the connection under operating conditions to confirm the leak is gone before returning the pump to service. This sequence ensures you’re solving the root cause (loose or damaged seal) rather than masking it, avoids over-replacing parts when a simple fix suffices, and uses proper torque and condition checks rather than relying on hand-tightening or sealant alone.