Well let me tell you what i do,I took a course on line there are many,some of the larger supply houses hold courses for this it was just faster on line for me,I bought a yellow jacket machine from johnston supply you will also need a torch set and a little bottle of oxagon,First you have to see if the unit has freeon in it that is called purging once the unit has gas you have to seal it back,that tech just sealed the unit so the freeon stays in after you seal back the line you attach your recovery machine to the unit with your gages attached,mycertified reclaiment company supplies me with the tansport tanks they always have a yellow color on the caps.my tanks are good for 125 lbs of freeon so i wweigh the tank when its empty then as is gets loaded i watch the weight so i know when its almost full,not to mention i am selling the r-22 for 3.00 a lbs to them now.hope i helped you.
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