How to Replace the Faucet Cartridge?

Is your sink faucet leaking or the lever not functioning smoothly? Chances are, the cartridge inside the bathroom faucet is worn out. Replacing it is easier than you think—even for beginners. All you need are the right tools and a compatible replacement cartridge.

How to Choose the Right Cartridge

The cartridge controls water flow and temperature, making it the most frequently worn part of your faucet. However, cartridges are not universal—each manufacturer uses different diameters, connection types, and pressure ratings. Choosing the wrong one means it won’t fit or function properly.

Tip: When buying a faucet, order a matching spare cartridge at the same time—it’s an inexpensive backup that saves trouble later. EU regulations also require brands to supply spare parts for 5 years after a product is discontinued.

Tools You’ll Need

• Replacement cartridge
• 2.5 mm Allen key
• Screwdriver
• Adjustable wrench or cartridge tool
• Soft cloth (to protect finishes)

Step-by-Step Cartridge Replacement

1. Shut off the water supply at the angle valves and open the faucet to release pressure.
2. Use a small tool to pop off the red/blue temperature indicator cap under the handle.
3. Insert a 2.5 mm Allen key to loosen and remove the lever screw. Gently lift off the handle.
4. Unscrew the decorative ring by hand or with a soft cloth to reveal the cartridge retaining nut.
5. Use a flat wrench (never a pipe wrench) to unscrew the cartridge nut and pull out the old cartridge.
6. Check the fitting for debris. Insert the new cartridge, aligning the tabs with the housing grooves.
7. Re-tighten the retaining ring, reattach the decor ring and handle, and secure with the Allen screw.
8. Snap the indicator cap back in place and turn on the water supply.

That’s it! In under 15 minutes, you’ve restored smooth faucet performance without replacing the entire fixture. For long-term peace of mind, choose quality cartridges from trusted brands like RBROHANT.