Plumbing · Plumbing
Replace a Mixer Tap Cartridge
Repair summary
If a mixer tap drips or feels stiff, the ceramic cartridge inside has failed. Shut off the under-sink isolators, lever the handle cap, undo the grub screw and gland nut, lift the cartridge out and replace like for like.
Likely issue
Worn ceramic disc cartridge
DIY difficulty
3/5
Estimated DIY cost
$25–$45
Estimated tradie cost
$180–$320
Tools required
- Allen key set
- Adjustable spanner
- Flathead screwdriver
Materials required
Step-by-step instructions
- Close both isolation valves under the sink and open the tap to release pressure.
- If a mixer tap drips or feels stiff, the ceramic cartridge inside has failed. Shut off the under-sink isolators, lever the handle cap, undo the grub screw and gland nut, lift the cartridge out and replace like for like.
Safety warnings
Take the old cartridge to the hardware store to match brand and size — fitting the wrong one can damage the tap body.
When to call a tradie
Call a licensed tradie if the work is outside the scope of this guide, involves regulated trades (electrical, gas, structural, waterproofing), or if you discover hidden damage. A professional will typically charge $180–$320.
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