Step 4 · Clean the Wall Fitting Threads

Once the old arm is removed, inspect the female threads inside the wall fitting (this is called a drop-ear elbow). It will likely have old plumber's tape, pipe dope, or mineral deposits. It is crucial to clean these threads thoroughly. Use a small wire brush or a pick to gently scrape out all the old debris. Finish by wiping the threads clean with a rag. A clean threaded surface is essential for creating a new, watertight seal.