Water Filter Replace ForEPTWFU01CUNILUX ULX220EPTWFU01 or EPTWFU01T NSF 42, 53 and 401 certified to filter contaminants: Tested and certified via way of NSF International opposed to NSF/ANSI standards 42, 53 and 401 in PureSource Ultra II – U and PureSource Ultra II – M for reduction of claims at the functionality records sheet Compatible Frigidaire Filter Model/Part Numbers: EPTWFU01 or EPTWFU01T EPTWFU01C 4562222 012505454226 UNILUX ULX220