Forage Storage Silos, Clamps and Compactors Demuth Steel Products, USA. Cobefa, Belgium. Goweil, Switzerland. McArthur BDC, UK. Reck, Germany. Ark Agriculture, UK. Moore Concrete Products, UK. Wolf System, Germany Permastore UK. Orkel, Norway. Forage Storage Silos, Clamps and Compactors Forage storage silos and clamps are structures used in agriculture to store bulk materials, primarily fermented feeds known as silage, for livestock consumption.