●Patented design stops up to 99.9% of fine dust and bulk debris before it clogs the dust collectors filter. ●Eliminates filter clogging and suction loss while protecting the collectors fan blower from harmful debris. ●Retrofits to any make/model single stage dust collector (3-5 HP recommended). 6" I.D. inlet and outlet ports for use with common ductwork. ●Mounts to any airtight, reinforced dust container. Includes assembly gasket and hardware. ●US Pat. 7282074, D703401