Ceramic Disc Cartridge
Also known as: disc valve, ceramic cartridge, tap cartridge
The mechanism inside most modern taps that controls water flow via two ceramic discs. One disc is fixed, the other rotates when you turn the handle — water flows when the holes in each disc align.
Inside the tap body, behind the handle. Remove the handle and unscrew the grub or retaining nut to access it.
Cylindrical body, usually 35 mm or 40 mm in diameter, with two ceramic plates at the base. Typically white or beige plastic with a brass or ceramic head.
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Always turn off the water supply before replacing any part. If in doubt, consult a qualified plumber. Gas components must only be worked on by a Gas Safe registered engineer. Unvented (pressurised) hot water systems must be worked on by a G3-qualified engineer. Prices shown are indicative — check retailers for current pricing.