Abstract: An apparatus for providing an enlarged drainage hole for the removal of animal bodily waste and other debris from the inside of livestock trailers including a grate assembly which slides into a grate housing that is adapted to receive the grate assembly. The grate assembly is inserted into the grate housing and is removed therefrom from outside of the trailer. The grate assembly, when inserted into the grate housing, cooperates with a drainage hole that is located inside of the livestock trailer to provide a smaller opening through the drainage hole than the drainage hole would otherwise provide when the grate assembly is removed from the grate housing. The smaller opening provided prevents any of the hooves and legs of livestock from passing through the drainage hole. When the grate assembly is removed a larger drainage hole is provided to aid in the removal of waste and debris from the inside of the livestock trailer.