A kitchen tap dripping continuously when the handle is turned completely off is caused by a worn-out ceramic disc cartridge, degraded rubber O-rings, or mineral scale sediment trapped inside the valve mechanism. Over time, friction and hard water wear down these internal seals, preventing the valve from closing tightly and allowing water to bypass the seal and escape through the spout. Verification: Shut off the water supply valves under the sink, disassemble the handle, and inspect the internal cartridge or washers for wear.
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