NOTE : ** For #55600 / 50761/ 43742/ 43742W it's important to verify USB pump/USB adapter replacement part(s) image against the fountain's existing part(s)The Replacement Drinking Fountain USB Pump with electrical cord and USB adapter is suitable for : Catit Fresh & Clear Cat Drinking Fountain w/ food bowl (50050) Catit Fresh & Clear Small Cat Drinking Fountain (50053) Catit Fresh & Clear Cat Drinking Fountain (3 L - green) ** (55600) Catit Fresh & Clear Stainless Steel Top Drinking Fountain (50023) Catit Senses Cat Drinking Fountain (3 L - blue) ** (50761) Catit 2.0 Flower Drinking Fountain ** (43742/43742W) Dogit Design Fresh & Clear Large Dog Drinking Fountain (10 L) *** (73651) Dogit Design Fresh & Clear Dog Drinking Fountain (6 L - powder blue) *** (91400)