Loading... Please wait...10L-450 | x05ni82cp110004 | BUMP GAS Carbon Monoxide 100 PPM, Methane 50% LEL [2.5% by volume] Hydrogen Sulfide 40 PPM, Oxygen 15%, Balance Nitrogen contained in a 10 Liter Aluminum Cylinder, For Use with Any and All Gas Detectors, Cylinder connection Built in Aerosal Trigger, Calibration Certificate NIST, Made in the USA