"If you buy the Petco Cat Water Fountain, spend the extra four or five bucks and get this too!!! Aside from the brush head separating from the handle (I glued it back in place - that's why it got 4 out of 5 paws), this brush was made for that machine. It reaches every nook and cranny and the small brush cleans the spout and pump with ease. I love this brush so much that I am seriously considering getting one for my twins' sippy cups. I've used many types of bottle brushes, but this design is by far the best! Silly, I know, but it does the job!!"