Used for sampling air volumes at a low jet velocity. Bottle joint is 24/40. Tube is modified with 12/5 joints, both vertical (use 7669-08 clamp). Nozzle is calibrated to deliver 0.09 to 0.11 CFM at 30.5cm H2O vacuum. Bottle is graduated 0 to 25 mL in 5 mL divisions.