The OmniFilter CB4-SS undersink filter cartridge has a slim design to make installing it quick and easy. The activated carbon block media offers a clean, great tasting drinking water. The OmniFilter CB4 Undersink Carbon Block Water Filter is used in the USM1, USM2 and OCT2 water filter housings. The Omnifilter CB4 also fits into the Culligan US-550, US-560, US-600, and CTR-210.
The CB4 is compatible with Culligan D-30 filter cartridge.