How to Repair a Leaky Single-Handle Cartridge Faucet
Step 1: Gather Your Tools and Materials
Before you begin, gather the following tools and materials:
- Allen (hex) wrench
- Pipe wrench or channel-lock pliers
- Screwdriver
- Utility knife
- Replacement cartridge valve
- Old toothbrush
- Heatproof silicone plumber’s grease
Step 2: Turn Off the Water Supply
The first step is to locate the water shutoff valves under the sink and turn off both hot and cold water supply lines running to the faucet. Make sure the valves are turned snugly tight.
Step 3: Remove the Faucet Lever Handle
To remove the old cartridge, you must first remove the handle. Locate the screw that holds the handle in place, which may be concealed under a plastic cap or sticker. Carefully remove the cap or sticker and use a screwdriver or Allen wrench to remove the screw. Lift and remove the handle.
Step 4: Remove the Retaining Nut
Depending on the faucet model, the cartridge may be held in place by a retaining nut. If you see the retaining nut once the handle is removed, use channel-type pliers or an adjustable wrench to turn the retaining nut counter-clockwise and remove it.
Step 5: Remove the Cartridge Retention Clip (If Present)
Some faucets have a cartridge retention clip, which is a U-shaped brass clip that holds the cartridge in place. To remove the cartridge clip, insert a flat-blade screwdriver behind the clip and gently pry it away from its retention slot. Carefully remove the clip.
Step 6: Remove the Old Cartridge
With the cartridge free of all clips and fasteners, it can be removed by lifting it up and out. If the cartridge is stuck, you can use a cartridge puller or the white plastic tool provided with the new cartridge kit.
Step 7: Purchase the New Cartridge
Taking the old cartridge with you to the store for comparison is often the best way to avoid mistakes when purchasing a new replacement cartridge.
Step 8: Install the New Cartridge
Apply a light coating of heatproof silicone plumber’s grease to all rubber O-rings and rubber seals on the new cartridge. Then, gently place the cartridge back into the faucet body and push down until it is fully seated. Install the retainer clip by placing it back into its slot until fully seated.
Step 9: Reassemble the Faucet
Once the cartridge is in place, the faucet is reassembled in the reverse order of disassembly. Replace the retaining nut and other parts as appropriate to the model faucet. Turn the water valves back on and test for leaks.
Tips
- If you assemble the faucet and find that the hot and cold water controls are reversed, then you have installed the cartridge backward. Disassemble and remove the cartridge, and rotate it 180 degrees before reinstalling.
- If you encounter any difficulties during the repair process, consult a professional plumber for assistance.