OCV FEEDERS produces different types of soundproofing systems to reduce the decibels generated by vibrating bodies. The first is the rubber coating inside the container which, in addition to reducing noise, prevents wear of the parts and the container itself. The second is the soundproofing hoods which can be made of fiberglass coated internally with sound-absorbing sponge or with structures made specifically in aluminum profiles and sheet metal\polycarbonate also coated internally with sponge where necessary. All this is made by OCV FEEDERS together with the circular vibrating feeder or the linear vibrator in Lombardy and positioned on a plate or frame in iron tubes.