Designed to fit all Waterdrop Pitcher Filtration Systems and Dispenser Filtration Systems (e.g., WD-PT-07, WD-PT-05, WD-PT-04, WD-WFD-22L, WD-WFD-40L, WD-PT-61B). -Lasts 3, 200 Gallons. One filter replaces more than 1600 standard 16oz water bottles, reducing plastic waste and saving you money.