That plumbers nightmare replaced the anode rod that belongs in the lowest fitting. Normally, you just remove the anode rod to drain the water heater. Someone must have wanted a draincock instead. I would flush out the water heater tank as best as you can. Hope it has not deteriorated too much for lack of an anode. Then install anode when going back in service. The other fitting or bung, is for an electric heater rod for heating water with shore power, saving propane.