Hello! I have some problem with the different between pipe thread of PT, NPT, FPT. I used to supply aome air valve with port size from 1/4"NPTF to 1/2" NPTF. Because a customer if require NPTF thread then he /she will states NPTF. But sometimes a US customer only say nedd Pipe taper thread or PT port etc, I will have question on PT, NPT or FPT. Are PT, NPT, FPT same thread?
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