Kitchen Faucet Cartridge Replacement: Find the Part Number and Swap It

Kitchen faucet cartridge replacement starts with the right part number: pre-2009 Moen single-handle kitchen faucets take a 1225, Delta single-handle DIAMOND faucets take an RP50587, and the swap needs only the under-sink stops, a screwdriver and pliers.

Which kind of kitchen faucet do you have: cartridge, ball or compression?

Moen and Delta single-handle kitchen faucets use a cartridge, a self-contained valve that slides into the faucet body under the handle. A Delta single-handle faucet with a dome cap and a round ball under it is a ball faucet. A two-handle faucet whose handles screw down tighter and tighter to shut off is a compression faucet with rubber washers. Compression faucets that still trickle after a rebuild may point to a separate restriction, covered in diagnosing low water pressure in kitchen faucets. Before swapping a cartridge, rule out a separate mechanical issue like pull down faucet not retracting, which often traces back to the hose weight.

Cartridge faucets get a new cartridge, ball faucets get a ball plus seats and springs, and compression faucets get washers. Our guide to cartridge, ball, compression and ceramic disc faucet types shows each one cut open.

• Cartridge: the handle lifts for volume and swings for temperature; under it sits a plastic or brass cylinder held by a clip or nut.
• Ball: Delta sells the RP70 ball assembly for lever handles at $25.00 online and the RP4993 seats and springs (2 each) at $8.08, per deltafaucet.com.
• Ceramic disc two-handle: each handle stops after a quarter turn; Kohler’s GP77005-RP hot ceramic valve is one example.

What are the signs a kitchen faucet cartridge needs replacing?

Replace the cartridge when the spout drips with the handle shut, the handle grinds or turns stiff, or the temperature drifts at the same handle position. Those three symptoms come from worn seals and scale inside the cartridge. A puddle around the spout base is a different failure, usually the spout O-rings, and weak flow is often a clogged aerator.

Check the aerator for grit before buying anything. Water seeping from under the handle cap, rather than out of the spout, means the cartridge seals are leaking internally.

If the faucet body itself is cracked or corroded, a cartridge will not save it. Our guide to fixing a leaky faucet walks through each leak point by faucet type.

Which cartridge fits your Moen, Delta, Kohler or Pfister kitchen faucet?

Moen kitchen cartridges are identified by the retainer under the handle and the faucet’s age, Delta’s current single-handle kitchen faucets use the RP50587 DIAMOND cartridge, Kohler two-handle faucets use quarter-turn ceramic valves such as the GP77005-RP, and Pfister’s pull-down kitchen faucets use cartridges such as the 974-074. Always confirm against the faucet’s model number.

Moen and Delta figures are each maker’s own web prices; we could not load Kohler or Pfister price pages.

How do you read the Moen retainer?

Moen’s kitchen cartridge guide sorts single-handle faucets by what holds the cartridge in. A copper U-clip means the 1225, introduced in 1981. A hexagonal brass nut means the 4000 (2005) or the 40002 (2000), which Moen calls interchangeable.

After 2009 Moen moved to Duralast kits: 1255, 160657, 150257 and 205013. Each kit has its own retainer nut, and Moen says the nuts are not interchangeable. The 205013 covers top-handle pullout faucets made after 2009, except the Dorsey 87007 and CA87007 and the Torrance 87666 and CA87666, which take a 4000.

Shower cartridges cause the most wrong purchases. The Moen 1225 vs 1222 cartridge comparison explains why the 1222 Posi-Temp never fits a kitchen faucet. Once you’ve confirmed the correct cartridge, plumber’s grease on the O-rings makes installation smoother and prevents premature wear.

How do you replace a kitchen faucet cartridge step by step?

Kitchen faucet cartridge replacement takes nine steps: shut both stops, drain the lines, cover the drain, remove the handle, remove the clip or nut, pull the cartridge, flush the valve body, seat the new cartridge, and test hot and cold. Moen lists pliers as the main tool for its 1225 kitchen swap.

1. Shut off the water. Turn both angle stops under the sink clockwise until they stop, then open the faucet to drain pressure. If a stop will not close fully, shut the house main.
2. Cover the drain. Drop in the sink stopper or lay a rag over it so a clip or screw cannot fall into the trap.
3. Remove the handle. Pry off the cap or plug button with a flat screwdriver and remove the handle screw. Moen Duralast top-mount handles hide the screw behind a small hole in the back of the handle, and sidemount handles in a hole on the bottom. Riobel’s SC101 kitchen faucet uses a 2.5 mm (3/32 in.) Allen key.
4. Remove the retainer. On a Moen 1225, slide the copper clip out of the valve body. On a 4000, Duralast or 210381, unthread the retainer nut. On a Delta single-handle, remove the parts above the cartridge in the order the faucet’s Delta parts diagram shows. Set every part aside in that order.
5. Loosen and pull the cartridge. Moen tells you to turn a 1225 a quarter turn (90 degrees) either way with the plastic twisting tool in the kit, lift the stem until it stops, then pull with pliers. Moen sells a cartridge puller at $42.24 for one that will not move.
6. Match the part. Compare old and new side by side: length, number of tabs, and the shape of the stem.
7. Flush the valve body. Moen strongly recommends cleaning and flushing the valve body before installing the new cartridge. Hold a cup over the opening and crack each stop briefly to blow out grit.
8. Install the new cartridge. On a 1225, line up the two clear plastic tabs with the cutouts, slide the copper clip back on top, and turn the stem so its small notch faces forward. Snug threaded nuts by hand plus a light turn; do not overtighten.
9. Test. Open the stops slowly and check that handle left gives hot and right gives cold. If they are reversed, Moen says to rotate the stem 180 degrees.

Moen’s 1225 kitchen faucet instructions add one hard stop: if the copper clip will not go in, or looks bent or broken, do not turn the water back on until you replace the clip.

How much does kitchen faucet cartridge replacement cost?

The part is the main expense for a DIY job. On October 28, 2026 the maker web prices ran from $14.88 for a Moen 4000 to $61.68 for a Delta RP50587. A full installed faucet replacement averages $262, with a typical range of $162 to $364, according to HomeAdvisor.

Is a new kitchen faucet cartridge covered by warranty?

Usually, if you bought the faucet. Moen’s Limited Lifetime Warranty promises free replacement parts if a faucet leaks or drips, for the original consumer buyer while they own the home, on faucets bought after December 1995. Delta backs its faucets with a Lifetime Limited Warranty, per its product pages. Neither pays for labor.

1. Find the model. Look for the model number on the receipt, the original box, or the faucet’s registration. Moen’s guide also points to its Identify My Product tool.
2. Gather proof. Moen asks for the original sales receipt. Delta registration on deltafaucet.com is automatic for orders placed there.
3. Call or file online. Moen’s US line is 1-800-289-6636 (1-800-BUY-MOEN). Delta’s is 1-800-345-DELTA (3358).
4. Wait with the stops closed. A dripping cartridge cannot waste water with the supply off.

If you inherited the faucet with the house, plan to pay for the part.

Should you replace the cartridge or the whole kitchen faucet?

Replace the cartridge when the faucet body, spout and sprayer are sound and the part is still sold. Replace the faucet when the body is cracked, the finish is failing, the pull-down hose leaks too, or the cartridge costs close to a third of a new faucet. A $14.88 to $61.68 cartridge almost always beats a $262 installed swap.

The RP50587 reviews show the tradeoff. Several Delta reviewers report the cartridge leaking again after about two years, while one says Delta sent free replacement cartridges for a 2013 Leland faucet over many years. If you are on your third cartridge, a new faucet may be the cheaper path.

When the answer is a new faucet, our guide to replacing the whole kitchen faucet covers removal, mounting and leak testing. Call a licensed plumber when a stop valve will not close or the supply piping is corroded.

What mistakes cause leaks after a cartridge swap?

Most callbacks after a DIY swap come from four mistakes: a cartridge not fully seated, a clip or nut that did not lock, grit left in the valve body, and hot and cold reversed. Moen says a 1225’s tabs must sit flush and centered on the valve body cutouts, or the clip will not seat.

• Forcing the clip: Moen says not to force it; push the cartridge down with the twisting tool until the clip slides in.
• Wrong Duralast nut: Moen’s kits use different nuts that do not swap, so keep the nut that came in the new kit.
• Reversed hot and cold: rotate the stem 180 degrees rather than buying a second cartridge.
• Ignoring seats and springs: on a Delta ball faucet, a new ball alone will still drip if the RP4993 seats are worn.