Heavy-duty Flo-Master™ “breaker bar” bulk bag massaging system promotes the discharge of non-free flowing materials. A powerful Flo-Lock® discharge spout closure system quickly halts material flow for partial bag discharge, while a Sure-Seal® spout clamping system seals the bag discharge spout for dust-tight operation. The unit includes a fully integrated discharge hopper with a pneumatic vibrator. Equipment includes intrinsically safe, all pneumatic controls for hazardous location service.