The patented MATERIAL MASTER™ Bulk Bag Discharger and Drum Filling System provides sealed discharge of fine, dusty powders. A Sure-Seal™ actuated spout clamping system seals the bag discharge spout for dust-tight operation, while a robust Flo-Master™ bag massaging system and rotary valve provide reliable metering of materials during drum filling. A powered Flo-Lock™ discharge spout closure system quickly halts material flow for partial bag discharging. Drum filling system features a dust-tight actuated filling head, densification system, gain-in-weight scale system and gravity roller conveyor. System is designed for Class II, Division II, Group G service.