The Catit Replacement USB pump adapter comes solely and is to be used ONLY with #50044 USB pump with electrical cord (available separately). Suitable for : Catit Fresh & Clear Cat Drinking Fountain (3 L - green) (55600) ** Catit Senses Cat Drinking Fountain (3 L - blue) (50761) ** Catit 2.0 Flower Drinking Fountain (43742/43742W) ** Catit 2.0 Mini Flower Drinking Fountain (43735/43735W) NOTE : ** For #55600/ 50761/ 43742/ 43742W it's important to verify USB pump/ adapter replacement part(s) image against the fountain's existing part(s) - as some models use 1 part instead (#50068 replacement USB pump with USB