went to replace my shower head some months ago (just a shower head, what could go wrong?). I remove the old one, clean the threads, apply the teflon tape, and screw on the head. Try it out; it's leaking from the threads! I try a couple more times, both with teflon tape and silicon grease, keeps leaking. I tork it down. SNAP! The end of the pipe breaks off! Seems they had used a chromed PVC shower arm (cheap ba$#@%&s). So I go to remove the shower arm, and get the whole pipe into the wall, all cemented together. To make it all worse, I had to get another shower head as the pipe broke off inside the fitting, and I couldn't get it out without damaging the thread.