GFG 7802-017 equivalent by GASCO 200 PPM Carbon Monoxide, 20 PPM Hydrogen Sulfide, 2.5 % Methane (50 % LEL), 4 % Carbon Dioxide, 18 % Oxygen, Balance Nitrogen Contained in a 34 Liter Disposable Aluminum Cylinder, For Use with Any and All Gas Detectors, Cylinder Connection C-10, Calibration Certificate NIST, Made in the USA, Ref#34l-416-CO2-4