I'll say this ,never heat with a torch as you can damage a filter/dryer or valve if the wrong part get hot.
Also never heat a filter dryer or you will evaporate the moisture you want it to hold
a heat gun on low to medium or a hair dryer for the tubing or compressor to help release moisture that has a stronger bond (surface tension) when on a metal surface than in free air (no bond)
my heat gun on high I can soft solder 1/2" ID plumbing tube



I forgot "you must" 
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