For big capacity a conveyor needs 2 things - a full tube and a positive, non-slip drive system. With Convey-All's new TCH models, you get both for capacity that rivals any auger. All TCH conveyors come with wider belts. The wider belts gently wrap around the product being conveyed so there is less roll back, the tube is fuller and capacity increases. A standard feature on all 10" and 14" TCH conveyors. 

http://www.conveyall.net/conveyors/tube-conveyors/tch-1000-series/