Ultimate Guide to Repair a Leaking Frost-Proof Sillcock Faucet - Premium Residential Valves and Fittings-Factory-Direct Supplier (2023)

  • January 20, 2023

In this blog post, you’ll read:Fixing a leaking faucet can be daunting, but don't worry about not knowing where to start – we've got you covered! Learning the steps to repair a frost-proof sillcock faucet can seem overwhelming at first glance

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Fixing a leaking faucet can be daunting, but don’t worry about not knowing where to start – we’ve got you covered! Learning the steps to repair a frost-proof sillcock faucet can seem overwhelming at first glance, but it’s more straightforward. Once you understand what needs to be done, you can repair your leaky faucet faster than saying, “stop the drip!” So grab a few tools and some helpful guidance, and before you know it, your faucet will work as well as new!

The Design of Frost-Proof Faucets

Ultimate Guide to Repair a Leaking Frost-Proof Sillcock Faucet - Premium Residential Valves and Fittings-Factory-Direct Supplier (2)

Frost proof faucets are essential to any home’s plumbing system, as they’re designed to prevent costly damage from winter freeze and frost. Thanks to the ingenious design of frost-proof faucets, homeowners don’t need to worry about their pipes bursting or costly repairs in the cold winter months. But have you ever wondered how these amazing little inventions work? Let’s take a look at just what makes frost-proof faucets so great.


  • The most common type of frost-proof faucet is built around a pressurized pipe that runs through a special valve. This valve opens when water is flowing through it and closes when pressure stops, allowing the water in the pipe to be stopped or reversed (if needed). This allows any frozen water in the pipe to flow out before freezing completely, preventing your outdoor faucet fixtures from freezing solid and bursting them. It also allows you to shut off the flow of water so that it doesn’t backflow into your home – something which could cause untold damage if left unchecked!
  • Another unique aspect of frost-proof faucets is their ability to drain themselves when temperatures drop automatically. These automatic draining mechanisms (sometimes called “freeze shutoffs”) work by sensing the temperature outside and then automatically opening up valves and draining out any standing water inside your pipes. This ensures that even if temperatures plummet unexpectedly, there won’t be any dangerous accumulation of ice that can potentially put cracks or leaks into your plumbing system. Furthermore, these features usually include adjustable time settings so you can make sure they do their job without severely impacting your daily routine!


Ultimate Guide to Repair a Leaking Frost-Proof Sillcock Faucet - Premium Residential Valves and Fittings-Factory-Direct Supplier (3)
  • One of the best things about frost-proof faucets is their relatively simple installation process compared with other fixtures. Unlike typical plumbing fixtures where complex new lines need running to connect correctly, frost-proof faucets can use existing piping systems with minimal difficulty.
  • They also don’t require extensive maintenance procedures down the line, which makes them incredibly appealing for those who want convenience and reliability above all else!
  • To top it all off – since there are no moving parts inside a frost-proof faucet – breakdowns are practically non-existent due to their rugged construction materials keeping them performing optimally throughout their service life span. Once installed correctly, this type of fixture will keep going forever! How cool is that?!

As far as overall effectiveness goes, a frost-proof mount can help protect your home from serious problems such as burst pipes during winter. When paired with proper insulation techniques, such preventive measures become priceless investments for any forward-thinking homeowner who values comfort indoors and efficient solutions too!

Leaks Around the Handle Stem

The lever handle is typically encircled with a sealing cord just below its mounting nut for older faucets powered by compression washers. If you observe liquid seeping from the threads of that same mounting nut, this might indicate an issue stemming from that particular component.

  1. If you’re faced with a leaking frost-proof sillcock faucet, the first step is to turn off the water at either the faucet itself or by cutting off all of the house’s supply. You can do this using a shutoff valve within your home. By taking these initial steps, you’ll be able to repair any leaks quickly and efficiently!
  2. Usually, the handle is held securely in place by a screw at the stem’s end. To take it off, loosen and remove this screw; then, you should be able to make light work of letting go of the handle.
  3. Once you’re done, remove the existing packing from around the faucet and wrap a few circles of new wrapping cord (commonly referred to as graphite packing) around the end. Usually, this wire is included in rebuilding kits, but if it’s not wrapped or sealed, then both old and new wrapping wires will be available.
  4. Finally, reinstall the packing nut and reattach the handle to reconstruct the frost-proof sillcock faucet. However, if the fault still exists, the last step will be to replace the faulty part, such as the O ring (rubber parts) or bonnet seal (cover), etc. The repair kit can be used to replace the electronic parts. Rebuild the frost-proof sillcock faucet. Although the technology is simple, the pre-preparation test will be critical; whether it is in materials, tool use, or workflow, it should be considered in detail.

Leaking From Anti-Syphon Fitting

Leaking from the Anti-Syphon Fitting of a Frost-Proof Sillcock Faucet can be a headache and an aggravation, but don’t despair; it’s an easy fix that doesn’t require professional plumber intervention!

  • First and foremost, ensure the unit’s water is shut off at their respective valves.
  • You’ll then need to locate the appropriate tool to remove the packing nut – a large adjustable wrench or a pipe nipple wrench works great. Carefully cut away any old caulking (inside and out) with a utility knife before unscrewing the packing nut by turning it counterclockwise. With this nut removed, you can now remove and replace any O-rings that have seen better days due to age or wear.
  • Next, grease up said O-rings with certified plumbing-grade silicone grease for optimal results before sliding them onto the corresponding surfaces on both pieces you just removed. Reassemble the faucet in reverse order, being careful not to over-tighten everything so as not to cause further issues.
  • Finally, add fresh caulking around all areas initially penetrated by putty when installing – inside and out! Rotate the open/close operation of your newly repaired Frost-Proof Sillcock Faucet several times after sealing to ensure no leaks remain before shutting off the valves at their respective points of origin.

Worn-out Stem Washer or Cartridge

Ultimate Guide to Repair a Leaking Frost-Proof Sillcock Faucet - Premium Residential Valves and Fittings-Factory-Direct Supplier (4)

When it comes time to replace your worn-out stem washer or cartridge of a frost-proof sillcock faucet, there are a few essential steps to follow to replace and restore your faucet to its optimal performance.

  • First and foremost, you will want to turn off the water supply. This can be accomplished by turning off the internal shutoff valve or closing the house.
  • Second, after unpacking the new stem washer or cartridge from their packaging, you will want to loosen and remove the handle screws from the faucet.
  • Thirdly, you must unscrew the mounting nut from the faucet body to remove the entire valve stem. The fourth step is inspecting the washers and O-rings at the end of the faucet stem and replacing them as necessary. These end washers are often held into place with brass screws at the top of the stem.
  • Lastly, reassemble the faucet, turn it on and test out for any leaks that may remain after going through these five steps properly.

Hofen Tips

Ultimate Guide to Repair a Leaking Frost-Proof Sillcock Faucet - Premium Residential Valves and Fittings-Factory-Direct Supplier (5)

It is essential that when attempting this repair or replacement, all pieces fit together tightly without any presence of leaking water before officially using back in full service -this will safeguard against any potential water damage in later stages while providing optimal spray force regarding your indoor needs depending on individual needs across households everywhere. Remember to clean up any debris left behind while at it!

The Flaw in the Valve Body

Leaks can be highly irritating, mainly caused by The Flaw in the Valve Body of a Frost-Proof Sillcock Faucet. Since these faucets cause leaks due to a defect in their valve body, fixing them may seem daunting. Fortunately, understanding the problem and how to fix it is much less intimidating once you have the right strategy. Here are some tips on what to do when you encounter a leaking Frost-Proof Sillcock Faucet!

Identify the problem

Ultimate Guide to Repair a Leaking Frost-Proof Sillcock Faucet - Premium Residential Valves and Fittings-Factory-Direct Supplier (6)
  • Firstly, you should identify the problem. A Frost-Proof Sillcock Faucet uses an interior valve core that controls water flow for both hot and cold water lines.
  • When its valve body is defective, water will flow even after the faucet handle has been turned off. It’s easy to recognize this flaw as water will drip from both ends of the faucet handle – a common sign that the valve body is not properly sealing.


  • Secondly, how do you go about fixing this? The best solution would be to begin by replacing the faulty valve body with one that works correctly.
  • To do so, switch off your main water supply line before dismantling your indoor plumbing and frost-proof sillcock faucet or finding a qualified plumbing professional to assist.
  • Once dismantled, replace each part of the existing valve body with one that fits well and doesn’t leak when fully fastened according to product instructions.


Ultimate Guide to Repair a Leaking Frost-Proof Sillcock Faucet - Premium Residential Valves and Fittings-Factory-Direct Supplier (7)
  • Lastly, another helpful way to prevent leaks caused by a defective valve body is by performing monthly or yearly maintenance steps depending on your season’s temperature and moisture levels.
  • This includes ensuring your sealant around all pipes is intact and that nothing is blocking drainage holes found at cabinets below sinks indoors or outdoors near spigots.
  • And inspecting every pipe connection housed within walls exposed behind drywall inside your home for any rusting signs or early deterioration from weather conditions outdoors – confirming all exterior wall faucets are functioning correctly before winter sets in!

Wrapping up

Fixing a leaking Frost-Proof Sillcock Faucet is no easy task, but it’s doable with the right know-how. Simply identify the problem, replace the faulty valve body, and maintain it regularly! That way, you can avoid more costly repairs down the line.

Hofen sanitary, with a decade of experience in manufacturing faucet hardware, can provide you with the knowledge and products to ensure your faucets are up to par. Contact us today for more information!

Solutions For Waterworks Plumbing


How do you stop a frost proof faucet from leaking? ›

If the faucet leaks from around the handle just when the water is turned on, the stem packing may be leaking. In some cases, you can fix this by simply tightening the retaining nut that's under the handle. Remove the screw in the center of the handle and pull the handle off. Try tightening the nut slightly (Photo 1).

Why is my Silcock leaking? ›

One of the most common reasons why your sillcock could be leaking is due to a work-out cartridge or stem washer. To identify if this is the problem with your water hydrant, notice if when you try closing the handle, water refuses to stop flowing completely.

How do I know what model Sillcock I have? ›


It is identifiable by the vacuum breaker located on top of the faucet behind the handle. The arrow is pointing to the vacuum breaker. The models are identified by the country on their handles or by counting the threads on the physical inside stem assembly.

What is the difference between a hose Bibb valve and a sillcock valve? ›

What are hose bibs and sillcocks? A hose bib is a water faucet that sits on your home's siding. The valve that allows water to flow through the faucet—and the entire faucet itself—all reside on the exterior of the house. A sillcock is an outdoor faucet as well.

Why is my outdoor frost free faucet leaking from the top? ›

If you find that the faucet starts leaking again after a short time, the valve seat is worn and you should replace the entire frostproof faucet. If the faucet is attached with threads, you can simply turn off the water, unscrew the faucet and replace it with one that's the same length.

Why does my frost free valve leak? ›

As with indoor faucets, the most common reason for leaking is a worn-out stem washer or cartridge. The symptom of this kind of leak is when closing the handle fails to stop the flow of water, which usually continues to drip or flow in a slow trickle.

Why is my outside faucet leaking after freezing? ›

A cracked vacuum breaker cap can cause the frost free faucet to leak water supply. If the vacuum breaker cap is damaged, it will not form a water tight seal, which can allow water to escape the hose bib. To fix the leaky outdoor faucet, this component can typically be replaced.

Why is my outside spigot leaking when hose attached? ›

If your hose leaks where it connects to the spigot, it's most likely caused by a worn gasket, stripped adapter, or leaking connector. Connection problems usually cost around $2–$20 to fix.

Why does my outside faucet leak only when hose attached? ›

You'll know you have a loose packing nut if water spews out from under the faucet handle only when the hose bib is turned on. If you have this problem, all you have to do is take a pair of pliers and tighten the packing nut by turning it counterclockwise. As the seal tightens, you should see the spigot stop leaking.

Why is my outside faucet leaking when turned off? ›

If your faucet leaks out of the spout when it's turned off, the washer is bad. On frost-proof faucets, the washer is located on the end of the long faucet stem. Remove the handle and nut (Photo 1) and pull the stem from the faucet (Photo 2). You may have to turn the stem to “unscrew” it before it'll come out.


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