MSA 10007049 Equivalent by GASCO 0.35% VOL. Pentane, 19% O2, 100 PPM CO, 25 PPM Hydrogen Sulfide, Balance Nitrogen contained in a 74L Liter Disposable Aluminum Cylinder, For Use with Any and All Gas Detectors, Cylinder Connection C-10, Calibration Certificate NIST, Made in the USA