Calibration Gas, CGA Number Not Applicable, Container Type Cylinder, Cylinder Capacity 105 L, Cylinder Diameter 3.2 in, Cylinder Height 12.8 in, For Use With All OEM Gas Detectors, Gas Mixture Refrigerant R-22 500 ppm, Gas Type Isobutylene, Product Type Calibration Gas, Chemical Formula C4H8, CAS Number 115-11-7, Accuracy +/-2 Percent, Background Gas Nitrogen, Calibration Certificate NIST, Cylinder Material Aluminum Alloy, Outlet Connection Size 5/8 In.-18, Outlet Connection Type UNF