One of the problems with the commercial ( if you can call it that ) is when you're doing exactly that. For example -12AN to 1/2NPT is necked down at the pipe thread size in the ID. Why or what is the point of increasing hose size for more flow if the adapter fitting is necked down in the pipe thread area. It defeats the propose. There are some fitting made by the so called hi-po manufactures don't have a clue. They get them all from the same place in china.
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