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Couple of weeks ago I intended to drain the hot water tank for the winter ahead. So I popped open the drain cock and let the water drain till it stopped. I went to find my 3/4 inch plastic plug for the anode when I removed it. I could not find the plug and so I put off pulling the anode. Today I went to Home Depot and got a new plastic plug. OK, so I took my crescent and loosened the anode rod. There was some water squirting but seemed fine to me. I loosened the rod some more and BOOM! The anode rod shot out of the heater like a bullet. I was soaked from head to toe with little white flakes from the anode all over me. Yes I laughed at first but then found the anode rod 30 yards away in the neighbors driveway, whoa!. My guess is the pressure must have collected in the tank during the 2 weeks. Probably would have been wise to open the drain cock again and open the hot water spigot to let out pressure before attempting this. Yikes, take heed and learn from my stupidly, be safe!