The Patented Material Master™ Bulk Bag Discharging System provides dust-tight discharge of non-free flowing materials. Exclusive Flo-Master™ “breaker-bar” bag massaging system promotes product discharge. A powerful Flo-Lock™ actuated discharge spout closure system halts material flow for partial bag discharge, allowing bag to be retied and removed. Sure-Seal™ actuated spout clamping system seals the bag discharge spout for dust-tight operation. Unit includes a fully integrated dust collection system and a 24-inch square lump breaker.