Wide Compatibility: Compatible with ULTRAWF, Pure Source Ultra, 1000472026, 203618461, 242017800, 242017801, 242017802, 242069601, 3957684, Kenmore 46-9919 46-9999, 469999, 9919, 9999, A0094E28261. NSF Certified: Undergone rigorous testing and certification by NSF/ANSI 42, a trusted independent organization that ensures the highest quality standards in water filtration.