Caleb MorganBy Caleb Morgan

Updated November 2026

Arrowhead frost-free faucets, often sold as Arrowhead Brass frost-free sillcocks, stop leaking when you replace the right arrowhead frost-free faucet repair parts. Most leaks come from a worn valve seat, a split packing washer, or a damaged stem. This guide shows you how to identify the failed part, order a match, and install it so your outdoor faucet holds pressure through the next freeze.

Identify the Faucet Model Before You Order Parts

Arrowhead frost-free faucets come in several lengths and inlet styles, and the internal components are not always interchangeable. Before you shop, check the stamp or label on the faucet body and note the overall length from the wall face to the spout tip. Measure the distance from the mounting flange to the end of the spout in inches, since length often determines which stem assembly fits.

Manufacturers specify that the model number usually sits on the wall flange or near the handle. If you cannot read it, remove the faucet and photograph the internal stem end. Matching visually is less reliable than matching by length and thread size, but a clear photo helps when you compare listings.

Common Parts That Fail

Most arrowhead frost-free faucet repair parts fall into a few categories. Owners often report that the failing component is one of these:

  • Packing washer and packing nut: the rubber seal around the stem that stops water from leaking past the handle when the faucet is off.
  • Valve seat and seat washer: the surface at the end of the stem that closes against the water flow. A dripping spout usually points here.
  • Stem assembly: the long shaft that carries water to the valve. Damage here often shows up as a leak at the base or a stiff handle.
  • Gaskets and O-rings: small inexpensive seals that sit where the stem meets the body.

Step-by-Step Replacement

Work in this order to avoid damaging the threads or losing small parts.

  1. Shut off the water supply to the faucet at the interior shutoff valve, then open the outdoor faucet to drain residual water.
  2. Unscrew the handle screw and remove the handle. Keep the screw in a small dish so it does not roll away.
  3. Loosen the packing nut with an adjustable wrench and back the stem out of the body. Frost-free designs are long, so expect the stem to be several inches long.
  4. Inspect the valve seat end of the stem. If the rubber washer is flattened, cracked, or missing, replace the washer. If the seat is pitted or grooved, replace the whole stem assembly.
  5. Check the packing washer and O-rings. Replace any that look hardened, split, or flattened.
  6. Apply a thin coat of plumber’s grease to new O-rings and threads, reinstall the stem, and tighten the packing nut snugly. Do not overtighten, or the stem will bind.
  7. Reattach the handle, slowly restore water, and test by closing the faucet and checking for drips at the spout and around the packing nut.

When to Replace the Whole Stem

If the stem threads are stripped or the length does not match your original, replacing the whole stem is usually faster than trying to salvage the old one. Mismatched lengths can prevent the valve seat from closing fully, so measure the old stem against the new one before installation.

Common Mistakes

  • Ordering a generic repair kit without checking the model. A near-match stem can leak at the body or fail to seat.
  • Forgetting to drain the line. Trapped water can spray when you remove the stem.
  • Overtightening the packing nut, which squeezes the washer out of shape and makes the handle hard to turn.
  • Skipping the grease on O-rings, which can tear during reinstallation.
  • Replacing only the washer when the seat is worn, leading to a repeat leak within a season.
  • Plumber’s grease: lubricates O-rings and threads so they seal and slide without tearing. View on Amazon
  • Adjustable wrench: provides the grip needed for the packing nut without marring the faucet body. View on Amazon
  • Assorted O-ring and washer kit: lets you replace small seals on hand so one trip to the store is enough. View on Amazon

If you are repairing a related outdoor fixture, you may also find these useful: Outdoor Faucet Leak Repair: 7 Best Kits and Parts Compared (2026) and Leaky Outside Faucet Repair: 7 Best Kits and Parts Compared (2026). For a guide to frost-specific kits, see 7 Best Frost-Free Faucet Repair Kit Options for Winter Leaks (2026).

FAQ

How do I know which arrowhead frost-free faucet repair parts I need?

Measure the faucet length and note the model stamp, then compare the failing component against the parts list. Replace the washer if the seat looks intact, and the full stem if the seat is pitted or threads are damaged.

Can I replace the packing washer without removing the stem?

In most cases no, because the packing washer sits on the stem and must be accessed by removing the packing nut and stem. Plan on taking the stem out for any repair.

Should I consult a professional for a frost-free faucet repair?

Most homeowners can handle a stem or washer replacement with basic tools. If the leak continues after replacement, or if the pipe inside the wall appears damaged, consult a licensed plumber.

Conclusion

Arrowhead frost-free faucet repair parts are usually inexpensive, and most leaks trace back to a worn washer, seat, or stem. Identify the model, inspect each component, and replace only what has failed. A careful install with fresh seals will keep the faucet dripping-free through the next winter.

Ready to choose one?

Caleb Morgan

About Caleb Morgan

Caleb Morgan is part of our editorial team and reviews and edits our kitchen faucets & sinks guides, checking product details against manufacturer specifications and owner feedback.