JKB and BGK, you're picking nits. Actually according to ANSI/ASME you are both wrong. NPT stands for "American National Standard Taper Threads"

Look up ANSI/ASME B1.20.1 specification and tell me what it says after "Basic Dimensions Of".

Enough of the nit picking. Will it matter in the grand scheme of things if someone calls NPT National Pipe Thread or National Pipe Taper? No. Both terms are understood to mean the same thing, although they are both not technically 100% correct.

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