Mixer tap dripping from the spout
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Most likely cause & what to check
Turn off the water supply under the sink — there should be isolator valves on both hot and cold supplies (turn the slot 90° to close). If there are no isolators, turn off at the mains stopcock.
Open the tap fully to release pressure and drain any remaining water in the pipes.
Remove the tap handles — there is usually a decorative cap on top hiding a screw (Phillips or Allen key). Remove the screw and pull the handle off.
Modern mixer taps use a ceramic cartridge — a cylindrical insert usually 35mm or 40mm in diameter. Unscrew the retaining nut and pull the cartridge out.
Take the old cartridge to a plumbers' merchant or DIY store to match it exactly — there are dozens of sizes. A replacement ceramic cartridge costs £5–£20.
Insert the new cartridge, ensuring it is oriented correctly (flow direction matters), retighten the retaining nut, replace the handle and turn the water back on slowly.
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