Repairing an Outdoor Frost-Free Faucet

How Frost-Free Faucets Work

Unlike standard outdoor faucets, frost-free (or freeze-proof) hose bibs have a long stem that extends through the wall so the actual valve seat and washer are inside your heated home. When you turn off the faucet, water drains from the exposed exterior portion, preventing freeze damage. This design means leaks often originate inside the wall, and the repair approach is different from standard outdoor faucets.

Diagnosing the Problem

If water drips from the spout when the faucet is off, the washer on the end of the long stem needs replacement. If water leaks around the handle when the faucet is on, the packing nut or O-ring behind the handle needs attention. If the faucet leaked during winter, the anti-siphon vacuum breaker may have cracked from freezing — this happens when a hose is left connected, trapping water in the faucet body and preventing drainage.

Replacing the Washer

Turn off the water supply to the faucet (there should be a shut-off valve inside the house on the supply line). Remove the handle screw and handle, then unscrew the packing nut. Pull the entire stem assembly straight out of the faucet body — it can be 6 to 12 inches long. Replace the rubber washer on the end of the stem and the O-ring on the stem shaft. Apply silicone grease to both before reinserting the stem assembly.

Winter Maintenance

Before the first freeze each year, disconnect all hoses from outdoor faucets — even frost-free models. A connected hose traps water in the faucet body, defeating the freeze-protection design. If your frost-free faucet has a separate indoor shut-off valve, close it and open the outdoor faucet to drain any remaining water. Insulated faucet covers provide additional protection in extreme cold. If you notice a wet spot on the wall inside your home near an outdoor faucet after a freeze, the faucet has likely cracked and needs immediate replacement to prevent water damage.