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Welding supply places. I have always used the easy method of frezzing my bottles and just hook up a line to the mother bottle, thats it.

you need to know if your mother bottle has a dip tube or not. If it does not have a dip tube, you need a stand that will hold the bottle upside down. You freeze your bottle for 3-12 hrs. Place you bottle on a scale, hook up a line to the mother bottle. Crack the valve on the mother bottle, crack the line to purge it of air at the small bottle, then open both valves and watch the scale. Do not overfill ....thats about it.

Sounds simple BUT be very careful as liquid nitrous CAN give you a freeze burn. Its best to have someone walk you through it the first couple times. I learned how to do it becasue instead of getting my bottles filled all the time, i would freeze bottles and transfer from 1/2 full to make a full bottle. This gave me a lot of practice..LOL LOL

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