Culligan D40 Level-4 Drinking Water Replacement Cartridge (Open Box) PRODUCT DESCRIPTION The D-40A premium filtration replacement cartridge works as a replacement filter cartridge for the Culligan US-550 and US-600A. The US-600A fits compactly and installs easily on a 3/8" cold water line under the counter for convenient access to filtered water from the existing kitchen faucet. The unit is designed with an integrated mounting bracket for added installation ease. Features: * Universal slim design installs quickly and easily to replace cartridge of Culligan undersink filter Nos.US-550 and US-600 * Also fits Culligan Nos.US-560 and CTR-210 * Activated carbon block with lead reduction material provides clean, fresh drinking and cooking water.Up to 6 month/600 gallon life Condition: Open Box Copyright All rights reserved.