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The Nitrogen is kept in a DOT approved container and we pour it into the size of container that fits the sleeve size...you should see the tall one we have for the 17" long x 8.250 diameter sleeve work we do...it's also good for a quick bag of ice in a plastic zip-lock late in the day...hahahha
Safety glasses too...but all you need is a simple pair of leather gloves....and of course a pair of pliers to pull it from the container when it's ready....the sleeve bubbles until it's down to the zub-zero temp required...when it quits making bubbles...we pull it and install quickly......the sequence is important too...you don't install right down the line etc....everyone has a secret or special way they do this process.....we've been using Nitrogen since about 1993....for every type of sleeve we install except most flanged ones....
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