I had one of these I bought when they first hit the market because I have a cat who loves to drink from faucets. He loved the fountain!After about 8 years of working great the water flow valve broke. I bought this one a couple of months ago and even though the fountain works great and my cat is happy with it, the auto fill cap on the bottom of the reservoir doesn't work at all. I can't figure out why and have tried every thing I can think of to get it to work. The first one worked fine, filling the bowl automatically as the water level went down. With this new one I have to do it manually. I make sure the bowl is filled to nearly overflowing every morning so that I don't have to worry about the water dropping so low that the pump doesn't have enough water to pump while I'm at work all day. Not sure if this one is just a lemon or if the design has been changed??? When I replace this one, it will be with a different model!