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To drain your fresh water tank, locate the drain valve. This is usually located outside the rig near the water tank. Open this valve and let the tank drain until empty (you can remove the fill cap to let air enter and speed things up a bit). If the tank has no drain valve you will need to empty it by running the water out of a faucet. If you do this make sure that you do not let the water pump run dry. Make sure to close the tank drain valve when done so that no foreign objects can enter the water system.