For easy, efficient, economical movement of sticky, stubborn, hard-to-handle bulk materials in bins, hoppers and chutes. The compact design assures simple, uncomplicated installation. All models are easily and quickly installed, singly or in groups on bins, hoppers, etc. ... all are built with weather and dust resistant housings at no extra cost. Can be easily mounted for free of product by vibrations like Parabolic Hoppers, Rectangular Hoppers, Rectangular Bins with Hopper Bottom, Cylindrical Bin, Conical Hopper.