The PetSafe® Drinkwell® Replacement Pump can be used as a replacement or as a back-up pump during pump cleanings. It is compatible with the PetSafe® Drinkwell®, 1.8L, 3.7L and 7.5L fountains and PetSafe® Drinkwell® Butterfly Pet Fountain 1.5L .  Trust PetSafe® to help keep your pet healthy, safe and happy