The PetSafe® Drinkwell® 2 Gallon Fountain Pump is compatible with the original version of the PetSafe® 2 Gallon Pet Fountain and can be used as a replacement pump for your pet’s fountain. There is a new pump design (PAC00-16977) for the 2 Gallon Pet Fountain available. To get the new, compatible fountain pump and needed accessories to transition your fountain, please contact PetSafe® Customer Care for your free conversion kit! Trust PetSafe® to keep your pet healthy, safe and happy.