This durable ground feeder includes three mineral compartments to provide expensive mineral supplements protection from the elements. The self-closing rubber cover fits over the feeder to keep out rain, snow, and dirt. Designed to withstand rough pasture use from livestock, our Bull mineral feeder is available in our standard Heavy Duty model or with the addition of a fly control feature. The fly control feature allows you to load a reservoir on top of the feeder with insecticide that is then distributed to a felt liner inside the feeder cover. As cattle push their nose under the cover to reach the mineral, the insecticide is transferred to the animals head, providing fly control.