The 3/8 thread my be as big as the 1/2 id but its not possible for the id of a 3/8 fitting to be 1/2 inch, its 3/8.The od of the thread does not translate to the size of the hole through it.3/8 means that the size of the hole is 3/8 which is not ,as far as I know as big as 1/2 inch.
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