we have a rockwood 8296ss and was wondering if we have any valves to drain out the low point lines. I have read that some models do have valves, if ours does, is there anyone out there that knows where to locate them. We just want to make sure that we are doing all that we need to when we winterize. Our last model didnt have any of these low point drains and we arent really sure exactly what to do with them..thanks