Gem Bids For Air - Zero Grade Of 99.999 Percent V By V Gas - Mixture Of Hydrogen And Helium Gas - Nitrogen Gas - O2_99.99 Percent V By V - 47l Gas - Co2 14.65 Percent V By V - 10l Gas - Carbon Monoxide Gas - Propane 2901 Ppmc- 10l Gas - Nitric Oxide 934 Ppm - 10l Gas - O2 - 22.24 V By V - 10 L Gas Cylinder - Co 4300 Ppm Bal Nitrogen