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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Description

🔧 Fix it fast, fix it right — Moen’s trusted cartridge for flawless flow!

UNIVERSAL FIT - Designed for single-handle kitchen faucets with ambidextrous handle orientation
OEM AUTHENTICITY - Genuine Moen part ensures perfect compatibility and performance
EFFORTLESS REPAIR - Replace your faulty cartridge without the cost or hassle of a full faucet swap
PREMIUM MATERIALS - Aluminium exterior and ceramic handle components for long-lasting durability
WARRANTY BACKED CONFIDENCE - Protected by Moen’s One Year Limited Warranty for peace of mind

The Moen 4000 Faucet Cartridge is an authentic OEM replacement part designed for single-handle kitchen faucets. Crafted with durable aluminium and ceramic materials, it offers a precise fit and easy installation, allowing you to repair plumbing issues quickly without replacing the entire fixture. Backed by a one-year limited warranty, this cartridge delivers reliable performance and peace of mind.

Specifications

Material	Plastic
Brand	Moen
Colour	N/A or Unfinished
Exterior Finish	Aluminium
Special Feature	Easy to Install
Included Components	Replacement Parts or Service Kit
Theme	Plumbing" or "Hardware
Item Weight	54 g
Metal Type	Aluminium
Handle Material	Ceramic
Hand Orientation	Ambidextrous
Net Quantity	1.0 count
Number of Items	1
Manufacturer	Moen Incorporated
Item Depth	1.75 inches
Global Trade Identification Number	00026508183205
UPC	026508183205
Department	Home & Garden
Country of Origin	USA
Item model number	4000
Product Dimensions	6.05 x 6.05 x 5.72 cm; 54.43 g
ASIN	B0031Q8J9Y

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