Waterdrop 17UA 3 Years Under Sink Water Filter, Under Sink Water Filtration System, Reduces PFAS, PFOA/PFOS, Lead, Chlorine, Under Sink Water Filter, NSF/ANSI 42 Certified, 24K gal. Extra RF17 Replacement Filter Cartridge For 17UA/17UB Under Sink Water Filter, Reduces PFAS, PFOA/PFOS, Lead, Chlorine, Bad Taste and Odor, NSF/ANSI 42 Certified, 24K gal. High Capacity. Compatibility: Suitable for faucets with 1/2 in. or 3/8 in. Female NPT thread. If a female threaded connector is needed to connect to your faucet, please contact us before purchase. Efficient Filtration: The Waterdrop Direct Connect Under Sink Water Filter System is tested by IAPMO against NSF/ANSI 42 for reduction of chlorine, taste and odor. Tested by KC authorative organization, it can effectively reduce VOC(chloroform), benzene, chlorobenzene, chloropicrin and styrene. It can effectively remove sediment, rust and other large particles. Tested by third party laboratory against NSF/ANSI 53 standard it can reduce lead. Besides, it can reduce PFAS, PFOA/PFOS. Solve Clogging Problem: By upgrading the filtration area, our filter now provides a 20X increase in dirt adhesion area, enhancing filtration capability while minimizing the risk of clogging. IAPMO Certified Safe. Material: Made from premium BPA-free and lead-free materials, the under sink water filtration system is certified by IAPMO against NSF/ANSI 372 Standard.