How to Replace a Bristan tap cartridge (UK)
Fit a genuine BC-CT-QT half-turn. UK isolation, ceramic disc alignment and lever refit.
Bristan
Identify
The Bristan tap cartridge is a BC-CT-QT half-turn. Measure diameter with vernier — Bristan used two body sizes on similar-looking taps.
Fit
Isolate under sink. Pop the hot/cold badge, undo the grub screw. Lift lever. Undo dome nut. Withdraw old cartridge. Fit new, aligning the spline at 12 o'clock so hot pulls back-left.
Test
Turn on slowly. Cycle full hot / full cold three times to seat the ceramic discs.
Frequently asked questions
- OEM or compatible?
- Bristan originals last twice as long in hard water. Compatibles OK for tenanted properties.
- Do I need silicone grease?
- Yes — silicone grease on the O-rings, never petroleum jelly (perishes EPDM).
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