Regulators are necessary equipment used to accurately deliver calibration gas from a cylinder to an instrument. Each regulator is designed to fit on a specific set of cylinders.

There are two common fittings these regulators use to connect to the non refillable cylinders. One common fitting is a CGA 600 connection and fits on the 17 & 34  liter steel cylinders.

The second common fitting is the 5/8 x 18 UNF fitting which connects to the 29, 34, & 58 liter aluminum cylinders and the 58 & 103 liter steel cylinders.