How to fix a leaky kitchen faucet cartridge
A dripping kitchen faucet often means the cartridge needs attention — and replacing or reseating it is something you can do in about 30–60 minutes with a few basic tools. This guide walks you step-by-step through diagnosing, removing, and installing a cartridge so you can stop the drip and restore proper handle action. Read all steps first, gather supplies, and work methodically to avoid surprises.
Step 1: Shut off the water
Locate the shutoff valves under the sink and turn them clockwise until snug; if there are no local valves, shut off the main water supply. Open the faucet to relieve remaining pressure and run water until it stops, which usually takes 10–20 seconds. Label the valves with tape if you think you’ll forget which is which.
[Illustration: hands turning shutoff valves under a sink with a rag underneath to catch drips]
Step 2: Prepare your workspace
Clear out the cabinet under the sink and place a bucket or towel to catch water. Lay down a soft cloth on the countertop to rest removed parts and prevent scratches; keep a small container for screws and clips so nothing rolls away. Turn on bright task light or use a flashlight for visibility during the job.
[Illustration: open cabinet under sink with bucket, towel, small container for screws, and flashlight]
Step 3: Identify faucet type and cartridge
Examine the faucet handle and spout to determine single-handle or double-handle design and look for a model marking on the escutcheon or underside of the spout. Use those details or take a photo to match the cartridge type when buying a replacement; universal cartridges exist but matching makes installation easier. Knowing the type prevents buying incorrect parts and saves time.
[Illustration: close-up of faucet handle removed showing stem and cartridge area with model marking visible]
Step 4: Remove the handle and trim
Use a screwdriver or hex key to remove the handle screw (usually 1/8–3/16-inch hex) and lift the handle off; remove decorative caps and the escutcheon using a screwdriver and gentle pry. Keep screws in the small container and note how trim pieces fit together, taking a quick photo for reference. Work slowly to avoid breaking plastic caps and springs that can fly out.
[Illustration: removed faucet handle and trim pieces laid out on a cloth with a small container of screws]
Step 5: Extract the cartridge
Loosen and remove the retaining nut or clip (typically 1/2–1 inch socket or pliers) holding the cartridge and gently pull the cartridge straight up; if stuck, apply penetrating lubricant and rock it gently while pulling for 1–2 minutes. Note the cartridge orientation and any O-rings or seals you remove so you can replace them in the same order; damaged O-rings often cause leaks.
[Illustration: hand pulling a faucet cartridge straight up with pliers nearby and O-rings visible on cloth]
Step 6: Inspect and replace parts
Compare the old cartridge, O-rings, and seals to the new parts; replace any O-rings that are cracked or flattened and use a light smear (pea-size) of plumber’s silicone grease on new O-rings for a better seal. If the cartridge is pitted, corroded, or warped, install the exact replacement cartridge; do not reuse a damaged cartridge because leaks will persist. Keep the old cartridge and parts until you confirm the new installation works.
[Illustration: old and new cartridges and small packets of O-rings on a work cloth with a tube of silicone grease]
Step 7: Reassemble and test for leaks
Reinstall the cartridge in the same orientation, reattach the retaining clip or nut (tighten to manufacturer torque or snug by hand plus 1/4 turn), and replace the handle and trim. Turn the water back on slowly and run the faucet through hot and cold to check for leaks; watch under the sink for 5–10 minutes while operating the faucet to confirm no dripping. If a leak appears, tighten the retaining nut a bit more or re-seat the O-rings and retest.
[Illustration: Reassemble and test for leaks]
- Bring the old cartridge to the store to match exactly when buying a replacement.
- Use a shallow pan to catch any standing water when removing the cartridge; expect 1–2 cups to drain out.
- Take photos during disassembly so you can reassemble parts in the right order.
- Label screws or small parts with masking tape if you have more than one similar screw size.
- If you can’t identify the cartridge, many hardware stores will help match by sight — allow 15–20 minutes for that service.
- Keep a small bottle of penetrating lubricant and silicone grease in your toolbox for occasional faucet maintenance.
- Do not use petroleum-based grease on rubber O-rings; it degrades them — use silicone plumber’s grease only.
- If you smell gas or see major corroded pipes, stop and call a professional — do not continue working near damaged plumbing.
- Avoid overtightening retaining nuts or handles; excessive torque can crack plastic parts or strip threads.
- If you are unsure which valve shuts off the water and can’t confirm isolation, shut off the main and call for help to avoid flooding.
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