The US-DC4-R Culligan direct connect under sink quick change advanced water system provides clear, refreshing, great tasting water directly to your faucet to make your drinks and cooking taste better than ever. This undersink system features a twist on twist off filter mechanism, quick connect fittings and double water shut off to make maintenance and installation hassle free. This filter is capable of reducing chlorine taste and odor in addition to particulates class III, so you can rest assured that your filter is producing safe and great tasting water. Compatible with direct connect line of products (US-DC1, US-DC2, US-DC3 and US-DC4).