GP-CO2-ZER... Std: 99.99+% Pure CO2, LT 0.1 ppm THC, ND levels of VSC, VOX, AHC, NOx, HCN, VCL, PH3, CO, NH3, H2O for CO2 analyzer, Zahm % purity & sensory test reference, in ED size disposable DOT SP-11323 steel cylinder, UN1013, CGA-320, approx 800psig., 1,230 L useable gas (ED cyl dims: 4_ OD x 23_ H = 3.7L IV [10 cm OD x 58 cm H]). No demurage charge.(2015)