Model RP Calibration Cylinder. Combination gas cylinder contains:

• 1.45% methane,
• 300ppm carbon monoxide
• 15% oxygen
• 10ppm hydrogen sulfide in nitrogen

Contents are at 500psig, and the aluminum cylinders measure 13-3/4" x 3". The Model RP weights 1 lb. 11 oz. and contains approximately 58 liters at atmospheric pressure. Reactive gases have an expiration date listed on each cylinder.