I bought the 32 Oz a few months ago, as we have two medium dogs. It works great and it is wonderful that I do not have to fill it twice a day like other bowls have been for us in the past. Trouble is the nozzle/spring load piece broke so it's not working now, and I can't find that piece anywhere. I don't want to have to re buy the whole tank when all we need is the twist on/dispenser piece.