Abstract: A device for maintaining material flow that can be mounted on either the inside or outside surface of a material dispensing bin. The device includes a material disrupting slide, attached to a reciprocating piston rod that is actuated by a pneumatic or hydraulic cylinder. The reciprocating piston rod may be either circular or non-circular in cross-section, the design defining whether the rod be fixed or non-fixed with respect to longitudinal rotation. To maintain material flow, the device is mounted in a region in the bin where material blockage is likely to occur. The device may be operated in continuous, timed or flow-sensor mode.