Big suspension Poultry Drinker / waterer are working on the ballasting principle. As water is taken, the load lightens and the valve system lets water in again. This waterer is ideal for up to 300 chicks, or 150 layers, or as a home-breeder waterer. 10mm water connection. Adjustable water level. Dish diameter is 37cm and height is 55cm overall. Working pressure from 0.2 to 0.5 bar (3 to 8 psi).