How to Repair a Leaky Cartridge for Sink Faucet?

Leaky Cartridge Faucet is a common problem that can be seen in every house and piece of work to Repair a Leaky Cartridge for Sink Faucet is easy too. Even a small leak can waste three gallons of water into the sewer every day. This is just a small leak. Larger faucet leaks can waste more than 30 gallons of water per day. And you will have wasted enough money to pay the annual water bill. We’ll discuss many possible reasons that can cause leaks and its solution to repair a leaky cartridge sink faucet.

If your cartridge sink faucet is leaking, you need to repair a leaky cartridge for sink faucet. We will tell you everything about cartridge faucets and show you how to fix them yourself. No matter where the faucet is leaking, you can follow the steps below to make a repair yourself. We will provide you with step-by-step instructions on how to repair a cartridge-style faucet.

Materials You Need

  1. Plumber’s Grease
  2. Replacement Cartridge

Equipment You Need

  1. Pipe Wrench or Pliers
  2. Allen Wrench
  3. Phillips Screwdrivers
  4. Flathead Screw

Step-by-Step Instructions to Repair a Leaky Cartridge for Sink Faucet:

1. Turn Off the Water Supply

turn off water supply - repair a leaky cartridge sink faucet

Look under the sink and find the shut-off valve on the water supply line of the faucet. Close the valve of the faucet you are about to operate by turning the handle clockwise until it stops. If your house does not have a shut-off valve under the sink, turn off the water supply to the house through the main shut-off valve.

2. Remove the Faucet Handle

Remove the Faucet Handle - repair a leaky cartridge sink faucet

After turning off the water supply, check the faucet handle to determine how it is installed. Some handles have fixing screws on the side or back. Others have a decorative cap (usually plastic) with a screw that holds the handle hidden inside. Your faucet may also have a detachable lever that can be unscrewed from the handle base for easy access to the handle fixing screws.

3. Remove the Retaining Nut

Remove the Retaining Nut -repair a leaky cartridge sink faucet

Use a pipe wrench to loosen the cartridge retaining nut. Unscrew the nut completely and remove it from the faucet. You may need to remove the old screw and reuse it in a new cartridge.

4. Remove the Faucet Cartridge

remove the old cartridge

Check the old cartridge. If it is more damaged than the damaged O-ring, it needs to be replaced. Put in the new cartridge and push it firmly into place. Carefully replace the retaining sleeve and clip. Again, attach the handle and fasten it with screws.

5. Install the New Faucet Cartridge

new faucet cartridge

You must install the new cartridge likewise the old cartridge. Remove the cartridge from the faucet body. If necessary, use pliers to grip the shaft on the top of the cartridge to pull out the cartridge.

6. Complete and Turn On the Water Supply

Open the stop valve for the water supply from the faucet and keep it open counterclockwise—test whether the faucet is working properly.

Manual: How to Repair a Leaky Cartridge for Sink Faucet

Video Instructions

Video Source: YouTube (Danco, Inc.)

Manual: Repair a Leaky Cartridge for Sink Faucet

Causes of Leaky Cartridge Faucet

There are many reasons that can cause leaky cartridge. Here are some of the reasons:

1. Broken Parts

If the leak comes from the pipe under the sink, the cause is probably a damaged or broken pipe. That’s the time you should buy a new part and replace it with that new one.

2. Loose Parts

Over time, the adjusting ring and packing nut in the water flow screw may loosen, causing the sink handle to start leaking. Tightening the packing nut or replacing it can usually solve the problem of a leaking faucet.

3. Bad O-Ring

The cartridge is a valve that controls the flow of water into the outlet of the faucet. One problem that occurs in cartridge faucets is worn O-rings. This is a small disc that is attached to the stem screw that holds the faucet handle in place. If your sink handle is leaking, this is most likely the cause.

4. Worn-Out Washers

Another common cause of faucet leakage is a problem with the washer on the valve seat. Over time, the friction between these two components can cause the washer to be worn out. If the washer is installed incorrectly or has the wrong size, a leak from the tap may also occur. This mainly occurs in compressed faucets.


How do I know if my faucet cartridge is bad?

Signs that a cartridge faucet needs repairs include dripping from the faucet, difficulty adjusting the water temperature, hot water entering the cold water outlet such as the toilet water supply pipe, and insufficient water heating for some faucets.

When Should I replace my faucet cartridge?

If dripping from the nozzle after replacing the valve seat and spring, also replace the filter element. If your faucet is leaking around the handle, the O-ring on the faucet is broken.

Can a bad faucet cause low water pressure?

The main reason for low water pressure is likely because of clogged faucet or aerator.

Final Thoughts

If none of these steps fixes the leaking faucet, the faucet may need to be replaced. Hard water and various cleaning products can cause damage to the faucet. If you don’t want to take this task on your own, the nearest professional plumber can repair or replace your faucet.

4 thoughts on “How to Repair a Leaky Cartridge for Sink Faucet?”

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