You guys are making me nuts with this helium pumping. Take a trash bag and make a billows. Tape is around the compressor inlet and the helium tank valve. Flow the helium so that it holds the billows while running the compressor. You can make any mix you want this way. The trash bag is just a tad cheaper than the Haskel, and you can buy a compressor for less than a haskel. It works, I have done it, and I know of others on these lists who have done it. - G
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