I bought this galvanized 5 gallon waterer new. As the chickens drink the water empties but the tank remains full. Seems like there is some kind of vacuum that keeps the water from coming out. Once I fix the vacuum the water keeps coming out. I built this dead level platform for it to sit on. There is a pin that comes out from the bottom that the top locks on to. Is this correct? Is this waterer made to hang from something and I bought the wrong kind? Any advice out there? I need some. I am about ready to pull my hair out. John