kitchen faucet with emphasis on the cartridge valve, which replaced the ball valve on newer faucets
Illustration: Harry Campbell
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Cartridge Valve

On many newer faucets; self-contained, simplified alternative to ball valve. Replace seals or O-rings in case of handle leaks; spout leaks require replacing entire cartridge. Note: After repairs, leave handle turned on before reopening water supply so that trapped air can escape. Otherwise, burst of pressure may crack disks in some cartridges.
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