CAST IRON BODY AND BASE. DEEP POCKETED, OPEN-ENDED CARBON STEEL ROTOR WITH ADJUSTABLE BRASS TIPS. 3.25" I.D. CONVEYING INLET, 2"NPT UPPER CHAMBER AIR VENT PORT, FLANGED MATERIAL INLET, 4"Ø SLEEVE CONNECTION ON PNEUMATIC DISCHARGE. VALVE HEIGHT: 14.25". CONFIGURED WITH A 12" SPROCKET, NO MOTOR.