A. Determine which side of the shower arm will be threaded into the wall. Use PTFE thread sealing tape and wrap it around the threads clockwise as you are holding the shower arm in your left hand and the PTFE thread sealing tape in your right hand. Wrap the PTFE tape completely around the threads 3 or 4 times, and if your piping in the wall is galvanized then you can wrap it 5 or 6 times. (This is based on using PTFE tape thickness of 3.5 mill with density of 0.4 and the fact the shower arm is brass which is a softer metal than galvanized pipe which may not seal properly without the extra PTFE tape applied.) Make sure you wrap the PTFE tape clockwise or it will unthread off the shower arm as it is threaded into the fitting in the wall. Put the escutcheon (trim ring) on the shower arm and hand tighten the shower arm into the fitting. Be very careful to start the threads so they won't get cross-threaded. Hand tighten two or three revolutions. Using a wrench tighten the shower arm two or three more turns. The shower arm should not be tightened more than a total of six revolutions. A professional grade strap wrench or rubber strap wrench will be best to use so you don't scratch the shower arm. Sometimes you can tighten the shower arm without the use of a wrench if you can get the right amount of leverage. As the shower arm tightens up after the fourth revolution you should begin to line it up so the outlet is centered in the down position. If you feel it is too loose after the fourth revolution, and the shower arm is still turning fairly easy then continue to tighten the arm the fifth revolution and line up the arm so the outlet is centered in the down position.