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You were doing the correct thing ... that is for getting the moisture out...so that acid does not form from the mixing of moisture and the oil in the system... causing flakes to come off the inside and plug up tiny holes ..like in the TXValve.
We are just saying that THEN... to test for leaks... you need pressure..
you can use a normal set of hoses and gauges... there are regulators which fit on the nitrogen tanks just like Oxy or Acet...
then that hooks to your AC gauges and you open the proper valves...
I have a nitrogen tank and gauges...will post pics... but can not find my dang camera... been missing for four days...
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