How to Repair a Freezeless Anti-Siphon Faucet

Repairing a freezeless anti-siphon faucet saves water and prevents water damage.
Repairing a freezeless anti-siphon faucet saves water and prevents water damage. (Image: beach faucet image by Scott Patterson from

New and remodeled homes are required to have freezeless anti-siphon faucets installed on the outside of the house. The anti-siphon device on these faucets is a safety feature. If someone was spraying pesticides using their garden hose, and there was suddenly a negative pressure in the city water main, the chemicals would travel back into the drinking water supply--if not for the anti-siphon device on the faucet. Keeping your freezeless anti-siphon faucet in good working order is the responsibility of every homeowner.

Things You'll Need

  • Four-way screwdriver
  • Adjustable wrench
  • Pliers
  • Penetrating oil

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Turn the main water supply off to the faucet, and then turn the faucet on to release the back-pressure

Remove the screw holding the handle on the faucet stem with a screwdriver. Pull the handle off the stem.

Loosen the packing nut located behind the handle with an adjustable wrench and then remove it by hand.

Pull the entire stem assembly out of the faucet body with pliers.

Remove the retainer screw and faucet washer at the opposite end of the stem with a small screwdriver.

Install a new flat rubber washer and screw.

Push the stem back in the faucet by hand.

Screw the packing nut on by hand and then tighten with a wrench.

Reinstall the handle and handle screw.

Turn the water back on. Turn the faucet on and off several times. Check for leaks around the handle and packing nut.

Tips & Warnings

  • If the handle is difficult to remove, spray penetrating oil on the stem, handle and screw threads. Let the oil soak in for 15 or 20 minutes before trying again.
  • Do not over-tighten the washer-retaining screw or packing nut, permanent damage may occur.


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