Basic Under Sink Filter System (US600A) by Culligan®. 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. D-20A cartridge, plastic tubing, and installation hardware included. The perfect solution for Bad Taste & Odor, Chlorine. Granular Activated Carbon Filter Cartridge. Filter Up To 1000 Gallon Capacity.