A dripping or squeaking tap usually points to a worn-out cartridge. Replacing a tap cartridge is a job you can easily tackle yourself with just a few basic tools, no plumber required. It's important to first identify the correct cartridge type: there are several types out there, including ceramic cartridges, mixer heads for single- and dual-handle taps, and clockwise- or anticlockwise-closing variants. The wrong type simply won't fit, or will make your tap turn the wrong way. In this guide, you'll learn how to spot the right cartridge, which tools you'll need, and how to get your tap watertight again in seven steps.
Replacing a Tap Cartridge: No Plumber Needed
Replacing a tap cartridge is a fairly straightforward job you can do yourself. That said, it's important to follow the right steps so you don't damage the tap.
What You Need to Know Before You Start
Before you get started, it's crucial to get hold of the correct cartridge type. There are several types of cartridges out there, and they aren't interchangeable. For single-lever mixer taps you'll typically need a ceramic cartridge, dual-handle taps use separate heads/inserts, and there are different versions depending on brand and bolt size. On top of that, lever taps come in a clockwise- and an anticlockwise-closing version: order the wrong one, and the handle will turn the wrong way. So always start with our tap parts finder to determine the right type before you order.
What Do You Need?
- A new tap cartridge (the correct type for your tap)
- Water pump pliers/adjustable wrench
- Screwdriver
- Towel
- Hammer
- Rubber gloves (for grip)
Step by Step
- Shut off the main water supply. This stops water from flowing out of the pipes while you're working on the tap.
- Drain the pipes. Open the taps so any remaining water can run out. If you're working on the ground floor, also open the taps upstairs for a moment so the whole system drains properly.
- Remove the handle. On a single-lever mixer tap, first pry off the cap on the back of the handle with a small blade, then loosen the hex screw underneath (usually size 2.5). Wiggle the handle loose and pull it off. Underneath you'll often find a domed ring: grip it with a rubber glove (for extra grip) and unscrew it. If it's stuck, tap it gently a few times to loosen it, then try again. If you have a dual-handle tap, the knobs are usually clipped on; gently wiggle and pull until the knob comes free.
- Remove the old cartridge. Loosen the screws, nuts, or bolts holding the cartridge in place, or use an open-end/ring spanner (usually size 17) to unscrew the cartridge.
- Install the new cartridge. Make sure none of the old cartridge's rings are left behind inside the tap, and check that the opening where the cartridge sits is completely clean and clear (see image). Fit the new cartridge and make sure it's seated securely.
Make sure the rubber seals on the cartridge are greased with
tap grease.
- Reassemble the tap. Reassemble the tap parts in reverse order of disassembly.
- Turn the main water supply back on. Turn the main supply back on and check that the tap works properly and there are no leaks.
Handy Tips
- Make sure you buy the correct cartridge: it needs to match the type of tap.
- Make sure the screws or bolts are secure, but not overtightened (hand-tight is enough).
- Check that none of the old cartridge's rings are left inside the tap.
- Run the tap for a moment afterwards to check for leaks.
Safety Tips
- Always wear gloves when working on water pipes.
- Make sure the area is well lit.
- Be careful with sharp tools so you don't damage the rubber seals or chrome finish.
Possible Issues
- If the tap doesn't work properly after reassembly, the cartridge may not be installed correctly. Double-check the installation.
- If the tap handle turns the wrong way, you've probably ordered the wrong cartridge. Lever taps come in a clockwise- and an anticlockwise-closing version (see details).
Frequently Asked Questions About Replacing a Tap Cartridge
Which tap cartridge type do I need?
That depends on the type of tap you have. Single-lever mixer taps usually use a ceramic cartridge, while dual-handle taps need a separate insert for each tap. There are also clockwise- and anticlockwise-closing versions for lever taps. Use our parts finder to quickly find the right cartridge for your brand and model, so you don't end up ordering the wrong part.
How do I know if my cartridge is clockwise- or anticlockwise-closing?
You can tell by the direction the handle turns: with a clockwise-closing cartridge, you turn the handle to the right to shut off the water, while with an anticlockwise-closing one, you turn it to the left. Not sure? Test the current tap before removing anything, or compare the old cartridge with the new one before you install it.
Do I need to drain the whole house to replace the cartridge?
No, that's not necessary. You only need to shut off the main water supply and drain the pipes by opening the taps. If you're working on the ground floor, it's a good idea to also briefly open the taps upstairs, so the entire pipe system drains properly before you start disassembling anything.
What should I do if the tap still leaks after reassembly?
First check that the cartridge is fully and correctly tightened, and that the rubber seals are greased with tap grease. If the leak continues, check whether the opening where the cartridge sits is completely clean and free of old rings. If the problem persists, the cartridge may not be compatible with your tap type.
