Applications Pneumatic Bulk gun Characteristics bulk Properties Airflow 1 Bulk is a PC COX SULZER pneumatic gun. Airflow 1 Bulk is a large volume pneumatic applicator with a 2 liter, 3 liter or 4 liter container. Airflow 1 Bulk is ergonomic, very robust and easy to use. This Airflow 1 Bulk pneumatic dispensing system from the manufacturer PC COX SULZER is made for low viscosity materials, for bulk application.