The H.F Stewart Even Flow Hopper's Ultrasonic boom makes for automatic hands free filling of the hopper. The H.F Stewart Even Flow Hopper has a constant high volume flow, but is easy on potatoes with it's minimal drop into the hopper. The main benefit of owning an Even Flow Hopper is just that, the even flow it provides to your operation keeps your graders working at a constant pace and has your trucks back in the field faster then the traditional method of unloading directly onto the bin piler.