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Culligan D-40A Under Sink Replacement Water Filter

Price $48.99 List Price Price $69.99 Save 30%
Availability: In Stock
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  • 1Filter$48.99 
  • 3Filters Price $46.09 each
  • 6Filters Price $44.09 each
  • The Culligan D-40 carbon block water filter is a 0.5 micron extra fine sediment water filter
  • The Culligan D-40 filter cartridge removes greater than 99.95% of Cryptosporidium and Giardia cysts
  • The Culligan D-40 water filter reduces Lindane and Atrazine (a pesticide and herbicide), mercury, bad taste and odor, sediment, and chloramine
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The Culligan D-40 replacement filter reduces extra fine dirt, sand, sediment, silt, rust particles, and turbidity. The Culligan D-40 water filter removes greater than 97% of lead. The Culligan D-40 water filters reduce bad taste and odor, sediment, and asbestos. Fits in undersink water filter systems. The Culligan D-40A is recommended for use with city and well water supplies. The Culligan D-40 water filter is tested and certified by NSF International to NSF/ANSI Standard 42/53 in model US-600A and US-600 which means that the Culligan D-40 replacement filter has passed rigorous testing standards. Note: Culligan has changed the model number of this filter from D-40 to D-40A due to a design change. The contaminant reduction remains the same. The D-40A has a flow restrictor which will reduce the flow rate more than the original D-40. The original D-40 is no longer being manufactured.
Package Qty1
Used In BrandsCulligan
Manufacturer's IdD-40
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

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-40 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