How to Change a Washer on a Garden Tap

Locate the main water valve.

Turn off the water to your house.

Locate the nut that sits just behind the faucet knob.

Remove the nut using an adjustable wrench.

Pull the faucet handle straight out to remove the valve stem; it should be approximately 12 inches (30.5 cm) long.

Remove the screw at the end of the long valve stem using a flat-head screwdriver.

Pry the old washer out carefully using a small screwdriver.

Find a new washer of the same size and shape.

Clean the seat where the washer will go with a small soft brush or toothpick.

Insert the new washer, ensuring a snug fit.

Replace the screw on the end of the valve stem.

Grease the threads on the valve stem with some silicone to make the faucet turn on and off easier.

Replace the valve stem into the faucet pipe.

Wrap the faucet threads with plumber's tape to ensure a snug fit.

Reattach the faucet knob.

Tighten the packing nut.

Turn on the main water valve.

Turn on the outside spigot.

Let the water run for several minutes to clean out any debris that may have gotten inside the valve stem and spigot while working on them.

Shut off the spigot.

Inspect the spigot to ensure that there are no leaks.