BFlex Single-Use Bronchoscope BFlex™ single-use bronchoscopes offer brilliant visualization, proven suction and exceptional maneuverability. BFlex Single-Use Bronchoscope BFlex™ single-use bronchoscopes offer brilliant visualization, proven suction and exceptional maneuverability. Size BFlex 2.80570-0416, Box/5 Insertion Tube Outer Diameter (mm): 2.8Working Channel Diameter (mm): NA