Hoppers Hoppers Drawings provided to facilitate mounting bin to hopper cone to retrofit all makes of bins. DiameterHeightAngleSlide Gate#of LegsBase Options 12′74″35°18″64×6 or 4×814′81″35°18″8double 4×4 or 4×815′85.5″35°18″8double 4×6 or 4×818′98″35°18″10double 4×6 or 4×8 (≤4000 bu)19′103″35°18″10double 4×6 or 4×8 (≤4000 bu)21′110.5″35°18″12double 4×622′115″35°18″12double 4×624′142″35°18″14concrete foundation required