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Culligan D-40A Undersink Water Filter Replacement Cartridge (Level 4)

$54.99 List Price $78.99 Save 30%
Availability: In Stock
Fits Culligan US-550, US-600, US-600A, and any brand of water filter system that uses standard 9 3/4 x 2 1/2 filter cartridges
  • Ships fast!
  • Made in the USA
  • Reduces chlorine, lead, asbestos and more
  • D-40A replaces the older D-40 model
› See more product details
  • Ships fast!
  • Made in the USA
  • Reduces chlorine, lead, asbestos and more
  • D-40A replaces the older D-40 model
Made in the USA, the Culligan D-40A undersink water filter replacement cartridge is a genuine OE part that will reduce contaminants and impurities from your drinking water for up to six 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 inch x 2-1/2 inch cartridges. Order the Culligan D-40A undersink water filter replacement cartridge online today.
Package Qty1
Used In BrandsCulligan
Manufacturer's IdD-40A
Advertised Size (in)10 x 2-1/2
Actual Size (in)9 3/4 inches (length) x 2 1/2 inches (outside diameter)
Actual Size (cm)24.77 x 6.35
MediaCarbon Block
Primary Filter MediaCarbon Block
Filter Life (gallons)600
Filter Life (liters)2,271.25
Filter Life (months)6 months
Micron Rating (Nominal)0.5
Flow Rate (gpm)0.60
Flow Rate (lpm)2.27
Country of ManufactureUnited States

Reduced Contaminants

The CULLIGAN-D-40 reduces the following contaminants:

  • Asbestos
  • Atrazine
  • Bad Taste and Odor
  • Chlorine Taste & Odor
  • Cysts
  • Lead
  • Lindane
  • Mercury
  • Particulates (Class I)
  • Sediment
  • Turbidity

The CULLIGAN-D-40 is comparable with the following part numbers

34377 47562 48167 432628
3437717 4234377 852-657 Ace 48167
American Plumber W-40 American Plumber WLC-R Ametek CTR-210 Ametek Kleen-Plus CMR-10
CMR-10R D-40 D-40A Do It Best 432628
GE GX1S15C LC1 Master Plumber 852-657 OmniFilter CB20
OmniFilter CB3 OmniFilter CB3 Series A OmniFilter CBF1 OmniFilter CBF20
OmniFilter CBF3 OmniFilter Deluxe OmniFilter OB3 OmniFilter OT2
OmniFilter OT32 OmniFilter SFM2 OmniFilter SFM3 OmniFilter Super
OmniFilter TC3 OmniFilter Total 2 OmniFilter Total Plus OmniFilter U400
OmniFilter U450 OmniFilter U500 OmniFilter U600 OmniFilter U700
OmniFilter UC2 Sears 34377 SY-2000 SY-5167
Teledyne WaterPik IR-70 True Value 852-657 US-550 US-600
US-640 Whirlpool WHCF-DB2 Whirlpool WHCF-DDF2 1020636


  1. The Culligan D-40A under sink water filter life is up to 6 months or 600 gallons, depending on the quality of your water
  2. The Culligan D-40A should be installed with the end of the filter with the hole, facing up
  3. If no water is passing through the system, the filter is likely installed upside down
  4. If the flow restriction in the Culligan D-40A is too great, you can increase the flow rate by drilling a larger hole, where the existing hole is, with a 1/8-inch drill bit