What is the procedure for bleeding or draining condensed water from heavy truck compressed air reservoirs (Druckluftbehälter / Entwässerungsventile)?

1. Pull or push the manual drain valve ring located at the bottom of each air tank daily/periodically to expel accumulated water condensation and check air dryer cartridge health
2. Drill a hole in the top of the air tank with an electric drill
3. Pour 5 liters of gasoline into the air reservoir
4. Air tanks must never be drained under any circumstances