I just wanted to give an update just in case someone else over tightens their drain plug. I went to Gooding Enterprises in Cottontown, TN. He is just outside of Nashville. He welded a new plastic female connector where the other one was. First he scraped off the old plastic piece. Then he attached a blank plastic disk, and then welded it on to the tank. He then drilled through the disk, into the existing whole, and tapped new thread. This way if I over tighten, the plug goes into the tank instead of pushing against the tank and forcing the connector off. All this for $49. I am very happy with his work.