I have bought two of these,and both waterers seems to have the same problem,,,they do not allow water to siphon into the lower drinking bowl.Each is identical,a 3 gallon capacity white plastic water tank, with a "handle" on the top that can be used to hang the waterer.I at first just set these on some wood blocks,but the next day when I checked the water level, none had been used and the red bottom drinking "bowl" was dry,so I pushed down on the bowl part,so air could get in and then water came into the bowl part. It's kinda like "birping" the bowl,as for some reason on both of these,as water is consumed,it does not drain into the drinking bowl.Then I tried hanging them up,on the idea the weight of the water was making the seal too tight,not allowing it to "birp",,but still the same effect,nothing drains down when the bowl is empty. Anyone else have this trouble with this waterer? I have 2 of them,that both has this problem,,and if it were 100 degrees out and my birds went all day without a drink,you can imagine the outcome. I think it would be best to shell out $35 for a 5 gal. capacity galvanized waterer,instead of fighting the problem on these $12 ones.