Doing a search, I came across this....

Section 16 - General Regulations
1:9 NITROUS OXIDE
Nitrous oxide permitted in E.T classes and A/PM only. The use of any agents other than nitrous oxide as part of, or mixed with, this pressurized fuel system is strictly prohibited. All bottles must be securely mounted, stamped with minimum DOT-1,800 pound rating, and identified as nitrous oxide. Nitrous oxide bottle(s) located in driver compartment must be equipped with a relief valve and vented outside of compartment. System must be commercially available and installed per manufacturer's recommendations. Commercially available, thermostatically controlled blanket-type warmer accepted. Any other external heating of bottle(s) prohibited.

Now, I bought a used NX kit but I was given a different bottle. It has these markings on it.

DOT-3AL1800 V****** M**** 1A98 15#CO2 TW18.5

Does this mean this bottle was intended to be used for CO2? Is there a difference and will this bottle pass tech?

Bobby