Tap Cartridges and Washers: Fixing Drips at Source
Modern mixer taps use a ceramic disc cartridge instead of the traditional rubber washer, but both do the same essential job of sealing the water flow when the tap is off.
Modern mixer taps use a ceramic disc cartridge instead of the traditional rubber washer, but both do the same essential job of sealing the water flow when the tap is off. A dripping tap almost always traces back to one of these two components rather than the whole tap needing replacement.
What it does
A cartridge uses two ceramic discs that rotate against each other to control flow and mixing; a traditional washer compresses against a valve seat to stop flow when the tap is closed.
How it fails
Ceramic discs wear or get scratched by grit in the water, letting a slow drip past even when closed; washers perish and harden with age and repeated use.
Repair or replace
Both are usually replaced as inexpensive parts rather than repaired, and doing so restores a dripping tap to like-new without replacing the whole fitting.
Fix a dripping tap
Tell us the tap's make if you know it, or send a photo, and we'll bring a matching cartridge or washer to sort it in one visit.
Questions we get asked
Can I replace a tap washer myself?
Yes, this is one of the most common DIY plumbing jobs, and many people manage it with basic tools after isolating the supply.
Is tap work regulated in the same way as gas work?
No, this is plumbing work, not gas work.
Why does my tap keep dripping after a new washer?
That usually points to a damaged or worn valve seat rather than the washer itself, which may need the tap body addressed instead.