31 cu ft 16 outlet with Split Shaft,Two Clutches with Black Metering Wheels for Cover Crop & Granular Chemical (Model # 623116C S) shippingLabel Rate control is achieved through 2 Blank Plate Rate control is achieved through in cab controller allowing operator to pre set up to two rates or change them on the go Drive Systems: Available in 12 volt electric or ground drive (which automatically compensates for ground speed) Operator may connect Zero Max rate controller to any live shaft on the parent implement with a constant RPM through a series of sprockets and jack shafts In cab control box monitors shaft to indicate metering wheels are rotating and warn if loss of air pressure