I tried plumbing tape, then more plumbing tape, then more plumbing tape. Still drips. The nozzle was actually sideways last time. It is tight and I'm afraid to go any tighter.
There could be a couple of things that may be happening to your boiler drain: 1. There could be cross threading that is happening (so no matter how much Teflon tape that you may apply....it will still keep leaking). If this is occurring, change out the boiler drain and add a new one (preferably a NIBCO brand) Check to make sure that the threads are good on the boiler itself....if not re tap the inner threads to accept the new boiler drain snuggly. 2. The boiler drain could be damaged and need to be replaced. (Simple Fix) remember that brass is soft and it may get damaged if over tightened in anyway. If you are still having issues you could come out of the boiler with a brass nipple and then attach the boiler drain.
