The Moen site says the part number for my faucet is 40002. Is this the same part?

It looks the same as the 4000 but is for an older discontinued faucet. It maybe a good part. Go for it. The other choice is to replace the faucet. I may buy one to see if it fits mine.

Will this fit to my Moen single handle filtering faucet model F87420?

There are 2 cartridges that fit into the Moen single handle. If your cartridge has a large square end this 4000 unit will work.

Can the red 3 o-ring washer be removed? Id like to use the oring from this and put on my old cartridge b/c its leaking (and I cant find replacement)

Yes, you can reuse the O-ring for the same model cartridge. The O-ring may be different, if the cartridge model is not the same. If the leak is from the O-ring greasing it will help. I find that the leaks are often in the internal ceramic pieces. They must wear out from usage and mineral deposits.

I have an older moen faucet called the Whitmore. The current cartridge threads in and has the thick square top. I dont see any threads on this part?

Hello and thank you for your interest in Moen products. The Moen Whitmore faucet requires cartridge number 1255, which is held in place by a black nylon threaded nut that is included with the cartridge. Moen faucets that use the 4000 cartridge are held in place by a brass nut, which can be reused and is not included with the cartridge. Please contact our Consumer Services Center for warranty assistance; they can be reached at 800-289-6636. Our current business hours are Monday through Friday from 8:00 am - 7:00 pm (EST).

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4000 Single-Handle Replacement Ceramic Cartridge, Genuine Moen Faucet Repair Part for Select Kitchen and Bathroom Faucets

Product ID: 29718077

Details

Brand
Moen
Color
N/A or
Material
Plastic
Product Dimensions
1.93"L x 2.6"W
Style
Replacement

🔧Single-handle precision fit

⚙️OEM authentic Moen part

🛠️Easy, hassle-free install

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25971CFA

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Details

Brand
Moen
Color
N/A or
Material
Plastic

Description

🔧 Upgrade your faucet game with authentic Moen precision!

QUICK DIY UPGRADE - Install in minutes with no plumbing expertise required—get back to your day faster.
SLEEK COMPATIBILITY - Designed specifically for select Moen kitchen and bathroom faucets—perfect fit guaranteed.
BACKED BY CONFIDENCE - Protected by Moen’s 1-year limited warranty for peace of mind and lasting reliability.
GENUINE MOEN QUALITY ASSURANCE - Trust the original equipment manufacturer for unmatched durability and performance.
EFFORTLESS FIX ZERO REPLACEMENT - Restore your faucet’s flawless function without the cost of a full replacement.

The Moen 4000 Single-Handle Replacement Ceramic Cartridge is a genuine OEM part engineered for select kitchen and bathroom faucets. Crafted for easy installation and reliable performance, it restores smooth water control without replacing the entire fixture. Backed by a 1-year limited warranty, this durable cartridge ensures your faucet operates flawlessly, making it the smart, cost-effective choice for modern home maintenance.

Specifications

ASIN	B0031Q8J9Y
Additional Features	Easy to Install
Best Sellers Rank	#57,832 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #64 in Kitchen Sink Faucet Replacement Parts
Brand	Moen
Brand Name	Moen
Color	N/A or Unfinished
Customer Package Type	1
Customer Reviews	4.5 out of 5 stars 1,219 Reviews
Exterior Finish	Chrome
Finish Types	Unfinished
Global Trade Identification Number	00026508183205
Hand Orientation	Ambidextrous
Handle Attachment Mechanism	screw
Handle Compatibility	Brand Specific, Model Specific
Handle Material	Aluminum
Handle Type	Lever
Included Components	Replacement Parts or Service Kit
Indoor Outdoor Usage	Indoor
Is Weight Bearing	No
Item Depth	1.75 inches
Item Dimensions L x W	1.93"L x 2.6"W
Item Type Name	Single Handle Replacement Cartridge
Item Weight	1.92 ounces
Manufacturer	Moen Incorporated
Manufacturer Part Number	4000
Manufacturer Warranty Description	1 Year Limited
Material	Plastic
Material Type	Plastic
Metal Type	Zinc Alloy
Model Number	4000
Number of Items	1
Product Dimensions	1.93"L x 2.6"W
Shape	Triangular
Specific Uses For Product	Inside
Style	Replacement Part
Style Name	Replacement Part
Theme	Plumbing" or "Hardware
UPC	026508183205
Unit Count	1.0 Count

Reviews

J**N

8.03.2026

A**R

21.01.2025

G**Y

9.03.2026

S**J

1.03.2026

A**R

10.02.2022

H**V

24.08.2024

T**L

6.02.2025

J**N

19.08.2025

L**L

6.08.2024

A**A

20.09.2024

E**Z

21.11.2021

A**R

10.06.2025

D**O

6.02.2017

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25971CFA

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In stock

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Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

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