The patented MATERIAL MASTER™ BULK BAG DISCHARGING SYSTEM provides sealed discharge of dry bulk materials. The unit features a pneumatic chain hoist with motorized trolley for efficient bag loading and unloading. A Sure-Seal™ actuated spout clamping system seals the bag discharge spout for dust-tight operation. It also includes a Flo-Master™ bag massaging system, which promotes positive material flow. A powered Flo-Lock™ discharge spout closure system quickly halts material flow for partial bag discharging. The unit features an integral loss-in-weight scale system and is designed for hazardous location service.