These are the Flexicon's High Flow Hopper that promotes flow of both free- and non-free-flowing bulk materials . It does this while eliminating residual material in the hopper as well as the requirement low promotion devices. It is especially built for the flexible screw conveyors. The hopper features a steep backwall as well as diametrically opposed sidewalls which have panel sections which are skewed outward on a horizontal axis thus forming a trapezoidal area. The divergent angle decrease the ability of non free flowing materials to form abridge between the hopper sidewalls and causes the material to topple and flow towards and down the steep backwall. The hopper walls form a trapezoidal inlet to the conveyor interface adapter which also has shear planes as well as vertical walls so as to direct the material into a rotating screw more positively than with previous rectangular interface adapters. The passive flow promotion attributes of the new hopper can eliminate . . .