Quote:
Originally posted by ultraflo
An alternate route to refilling a nitrous bottle, if you don't have or want to spend the cash on a refill station... is to chill the bottle you wish to refill, either in a deep freezer or a cooler full of ice and water. After several minutes of doing this, hook the small bottle directly up to the big bottle, open the valves, and the cold bottle will suck the nitrous out of the big bottle, while using a digital scale to keep track of how many pounds you are putting into the smaller bottle, of course... and, viola! One refilled nitrous bottle, no pump, no compressor. Just make sure you have a digital scale and a quality, inline nitrous filter between the bottles 
BTW, Nitrous Express sells a refill station complete with a digital scale... you supply the compressor and the bottles, however.
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That's how my local shop fills my bottles, I'm thinking of getting a piece of line and renting a bottle to to this, I will store the bottles in my garage refridgerator as well. What are you guys paying to rent a large refill bottle, how much per pound, how many pounds is a bottle? I pay 3.50/lbs locally to have my bottles filled, 2 a weekend..lol