Impingers used for sampling small air volumes at low velocities. Bottle with 24/40 stopper joint is available in 25 or 30ml sizes. The stopper is available with an open nozzle or one calibrated to deliver 0.09 to 0.11 CFM at 30.5cm (12in) vacuum. The stopper inlet is available as an open tube end, 12/5 ball or 12/50 socket. The stopper outlet is available as an open tube end or a 12/5 ball.