Saturate the joint with WD40 or similar penetrating oil, wait five minutes, try again. Yes, you might need a bigger wrench or a longer handle.
Before you install the new shower head be sure the threads are clean. Use cloth or steel wool and a little WD40 to remove the corrosion and crud. Go easy - you don't want to damage the threads. If the threads are badly damaged, stripped, or rusted then you might have to call somebody.
If it's all OK to go then apply teflon tape or gel to both surfaces and screw the new showerhead back on. Tight but not too tight. Turn on the water and check for leaks. Done.
Last edited by orangedog; 10/28/0905:50 PM.
"My actions are my only true belongings. I cannot escape the consequences of my actions. My actions are the ground upon which I stand." Thich Nhat Hanh
