Purchased from local pet shop. No apparent problems until ratties began to drink from it. A steady stream of bubbles to the top creates a suction effect that joggles the bearings inside, leading to a constant dripping. Bottle empties itself in five minutes. Rubber washer could likely have solved problem.On the plus side, the design of the bottle is keen. Laying flush to the cage and held securely in place. A shame about the leaking, though.