The first step is to turn off the water supply upstream of the faucet. Usually the best place to turn off the water is at the valve located on the house side of the water meter.
Open the faucet completely. While holding the faucet in place with a wrench or large pair of adjustable pliers, remove the valve assembly by using an adjustable or open end wrench on the section below the compression nut. Many houses in colder climates have freeze proof outdoor faucets that have valve stems that are to keep the water in the warmer areas of the house to prevent freeze damage. In warmer regions the valve stems are only a few inches long. The seating washer is located at the end of the valve stem. Remove the retaining screw holding the washer and use a small flat blade screwdriver to pry the old washer out. Replace the washer with a new one of the same size and shape. Replace the retaining screw tightening it with a screwdriver.
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