Unplug the refrigerator from its nearby power source and carefully turn the refrigerator around to have its back facing you.
Locate the water supply line on the back of the refrigerator, and turn the nut in the middle of the water line clockwise to tighten its connection.
Tighten the nut clockwise with a wrench once you can no longer turn it using your fingers.
Push the refrigerator back into place and plug it back into the power source. Push an empty cup against the water dispenser for five seconds to cycle through the refrigerator's water filter.
Pour the cup's water into a nearby sink and push the cup against the water dispenser once more for five seconds to continue flushing the filter. Continue dispensing the water into the cup and pouring it out until 12 liters of water is dispensed from the refrigerator.