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Internet #205553034

Model #CULLIGAN-D-40

Level 4 Undersink Filter Replacement Cartridge

  • Fits under-sink systems 9-3/4 in. x 2-1/2 in. cartridges
  • Treats water coming from wells and municipal sources
  • Reduces chlorine, asbestos, lead, mercury, and more
  • See More Details

Product Overview

The Culligan D-40 undersink water filter replacement cartridge is a genuine OEM part that will reduce contaminants and impurities from your drinking water for up to 6 months. Built to reduce chlorine, asbestos, lead, mercury and more, this filter will ensure you serve only the cleanest and crispest tasting water. Fits easily into undersink water filtration systems that use 9-3/4 in. x 2-1/2 in. cartridges.
  • Top of the line Culligan drinking water replacement cartridge
  • Recommended for city and well water supplies
  • Genuine OEM product
  • Reduces the following contaminants: asbestos, atrazine, bad taste and odor, chlorine taste and odor, cysts, lead, lindane, mercury, particulates (class I), sediment and turbidity

Info & Guides

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NameLevel 3 Easy-Change Inline Filter Replacement CartridgeLevel 4 Undersink Filter Replacement CartridgeCeramic Filter CandleCartridge Filter Set
Replacement Filter TypeUnder Sink Replacement FiltersUnder Sink Replacement FiltersUnder Sink Replacement FiltersUnder Sink Replacement Filters
Water Filtration System TypeUnder SinkUnder SinkUnder SinkUnder Sink
Number of filters included1112
FeaturesTwist and lock designNo additional featuresNo additional featuresNo additional features
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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Brand/Model Compatibility
Culligan, Pentek, American Plumber, Hydronix
No additional features
Filtration Method
Carbon Block
Number of filters included
Pack Size
Product Weight (lb.)
Replacement Filter Type
Under Sink Replacement Filters
Water Filtration System Type
Under Sink

Warranty / Certifications

Manufacturer Warranty
This Culligan product is covered by a 30 day limited warranty from the manufacturer.

Questions & Answers


Will it fit a 600A filter canister

Asked by George April 30, 2021

yes the culligan level 4 filter will fit in the 600a filter canister

will it fit US model 550

Asked by sill160 February 6, 2021

yes the culligan-d-40 fits us-550

What is the micron # ?

Asked by Handylady December 30, 2018

The filter comes with a 0.5-micron (nominal) filtration and has a filter life of 6 months or 600 gallons.

Does this cartridge fit in Culligan HF-150 and HF-160?

Asked by Dino February 26, 2018

Does this fit the Culligan Model US-600

Asked by tractorguy October 14, 2015

Yes, it fits the Culligan Model US-600.

Customer Reviews

  • 3.7
    out of 3 reviews
  • 100% recommend this product
Filter by:
Showing 1-3 of 3 reviews
It did not fit well even though ti was supposed...
It did not fit well even though ti was supposed to. The filter broke.
by KIM
by HomeDepotCustomer
Water filter works exactly as it should- is filtering water just fine
Product is what it's supposed to be- a water filter. Water travels through and comes out cleaner. There you have it. Fits in the container it's supposed to.
by Clarkkus
Showing 1-3 of 3 reviews