I was wrong. NPT stands for National Pipe Thread, which is the American standard. Item descriptions can be misleading as, for example, 1/4" NPT is not 1/4" but rather 1/2". And 1/2" NPT is actually closer to 3/4". There is a standard , which can be seen in a diagram available in particular on the Internet This product was in the form in which it was received, at least one specimen, in perfect condition, accurately described.
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