How to Fix a Leaky Faucet: Rotary-Ball Type
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Gather your materials, turn off the water, and empty the pipes.
You'll need a hex wrench, screwdriver, silicone grease, and utility knife as well as a repair kit for your brand of faucet (which includes O-rings, seats, and springs) and a replacement faucet ball, if needed. Shut off the water under the sink, and let the faucet run until water stops.