Free guides / Plumbing
How to Fix a Leaky Faucet
A faucet that drips once a second wastes over 3,000 gallons a year. In most single-handle faucets the fix is a new cartridge; older two-handle faucets usually need a new washer or O-ring.
Safety first
- Shut off both supply valves under the sink and open the faucet to release pressure.
- Plug the drain so small screws can't fall in.
Tools
- Adjustable wrench
- Phillips and flat screwdrivers
- Allen key set
- Needle-nose pliers
- Old towel and a cup for small parts
Parts
- Replacement cartridge or washer/O-ring kit that matches your faucet brand and model
- Plumber's grease (silicone)
Step by step
Turn off the water
Close the hot and cold shut-off valves under the sink, then open the faucet to drain the line.
Remove the handle
Pop off the decorative cap, remove the screw (often an Allen set screw) and lift the handle off.
Pull the cartridge or stem
Unscrew the retaining nut or clip and pull the cartridge straight up. Note which way it faces.
Match the part
Take the old cartridge or washer to the store, or look up the faucet brand's part number, so the new one is identical.
Install the new part
Coat O-rings with plumber's grease, seat the new cartridge in the same orientation, and reinstall the nut or clip.
Reassemble and test
Put the handle back, turn the water on slowly and check for drips and leaks under the sink.
When to call a pro
Call a plumber if the faucet body is cracked, the valves under the sink won't shut off, or water is leaking inside the cabinet.
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