The Cal Clip fits around the circular, black splash guard that is factory installed at the time of order on any of our black enclosure gas detectors or self-contained Controllers. It remains in place during the calibration process, allowing the use of both hands. The Cal Clip is made of light, durable ABS/polycarbonate plastic and comes in our signature blue company colour. It is specially designed to allow calibration gas into the sensor vent through a small barb hose fitting attached to standard or Teflon tubing. The barb hose fitting can accommodate two sizes of hose: 1/8” (3.175 mm) ID and 3/16” (4.762 mm) ID. While stored, the tubing can be left attached or removed from the Cal Clip as desired. NOTE: The Cal Clip is designed to prevent entry or exit of air except via the hose barb fitting, therefore it must be removed from the splash guard during normal operation or else the gas readings will not be accurate.