Re: What is this bolt on the water heater? Reply #25 – November 19, 2014, 10:55:17 am Yes, I have a 6-gallon tank. I just came in from changing the nylon plug. The old one turned out quite easily, which makes me think that maybe it somehow came loose. There was no indication of any teflon tape on the old plug. I put teflon tape on the plug I put back in.It seems to take a long time to get all of the air out of the lines. Maybe I'm just a bit impatient, but I would think that it shouldn't take more than a couple of minutes to get a good flow of water.Due to the cold temperatures I decided that I would just change the nylon plug now and then replace the whole hot water heater later, possibly at MOT. Quote Selected