Calibration Gas, CGA Number Not Applicable, Container Type Cylinder, Cylinder Capacity 74 L, Cylinder Diameter 4.25 in, Cylinder Height 14.25 in, For Use With All OEM Gas Detectors, Gas Mixture Helium 99.999 Percent, Gas Type Helium, Product Type Calibration Gas, Chemical Formula He, CAS Number 7440-59-7, Accuracy +/-5 Percent, Background Gas Not Applicable, Calibration Certificate NIST, Cylinder Material Aluminum Alloy, Outlet Connection Size 5/8 in, Outlet Connection Type UNF