I have an Admiral room air conditioner and I need to find out where the drain plug is, and how to remove it. When it rains the a/c fills up with water and then takes a few days to drain or evaporate. Manual says it has that and a drain pan, plus you can add flexible tubing to the hole. I have no idea where it is. It is about ready to become familiar with my hand drill. Thanks in advance for you help.