Piston-based barrier pack system with plastic lever and integrated flow regulator for controlled dispensing of highly viscous products. Available with 4 mm or 7 mm stem inner diameter, it supports 360° usability and enables fast filling before valve placement. Compatible with compressed gas propellant, achieving up to 96–98% evacuation. Offered with 13 mm, 26 mm, or 44 mm spreaders, ideal for applications including silicones, acrylics, glues, and food formulations.