Ideal Standard 25mm Ceramic Disc Cartridge — A861226NU
The Ideal Standard A861226NU is an authentic manufacturer replacement 25mm ceramic disc cartridge. Specifically engineered for slimline and compact single-lever mixer taps across Ideal Standard and Armitage Shanks brassware collections, this internal valve controls both water volume and temperature blending. Replacing a worn, limescaled, or leaking cartridge stops persistent dripping from the spout and resolves stiffness in the operating lever.
Identification Guide:
MPN: A861226NU | Old Barcode (EAN): 5055639179752 | Diameter: 25mm (D=25) | Mechanism: Ceramic Disc | Finish: NU (Neutral / Component Spare)
Key Features
- Original OEM Component: Exact 25mm outer body diameter with factory locating pins to fit slimline tap bodies accurately.
- Ceramic Disc Sealing: Precision-ground ceramic internal plates deliver smooth lever operation and positive shut-off.
- Direct Fix for Leaks: Stops water weeping around the lever collar or dripping continuously from the tap outlet.
- Compact Form Factor: Purpose-built for modern narrow-body basin and bidet mixers requiring a 25mm cartridge.
Installation Note
This unit has a 25mm outer barrel diameter. Most standard domestic mixer taps use 35mm, 38mm, or 40mm cartridges, while Ideal Standard FirmaFlow models use 28mm or 38mm units. Measure the outer diameter of your existing cartridge body before ordering to ensure a correct fit.
Fitting Tip: Isolate the hot and cold water supplies before dismantling. Remove the handle and retaining collar, lift out the old cartridge, clean out any limescale from the brass housing, and ensure the base alignment pins slot cleanly into the tap body before securing the retaining nut.