Step 5 · Clean the Female Threads
Once the old arm is removed, look inside the fitting in the wall (this is called a drop-ear elbow). You will likely see remnants of old Teflon tape, pipe dope, or mineral deposits. It is crucial to clean these threads thoroughly. Use a small pick or the tip of a utility knife to carefully pick out any old tape or sealant. Then, use a small wire brush or an old toothbrush to scrub the threads clean. Finally, wipe the inside of the fitting with a damp rag to remove any loose debris. A clean surface is essential for a good seal with the new arm.