Abstract: A sealing assembly for a conveying system between a conveying belt and a containment wall. The sealing assembly has a primary sealing subassembly, and a secondary sealing subassembly joined by a connecting assembly. The connecting assembly defines a locally flexible region whereat the sealing assembly can be reconfigured to allow selective movement of the primary and secondary sealing subassemblies, each relative to the other. The sealing assembly is configured so that with the sealing assembly in an operative position on a conveying system: a) the primary sealing subassembly is situated to block passage of material from a conveying portion of a conveying belt laterally beyond a containment wall; and b) the secondary sealing subassembly is situated to laterally confine material that has moved laterally beyond the containment wall from the conveying portion of the conveying belt, along a length of the conveying system.