I have a galvanized nipple threaded into a brass elbow that has a slow drip. I'm going to take apart and replace it. Should I use teflon tape or pipe dope when I reconnect. It currently has pipe dope residue on the threads. This nipple has been in place as long as I've owned the house, going on 20 years.
Any opinion on whether I should use a brass or galvanized replacement nipple?