NPT = National Pipe Thread
It the U.S. standard for Pipe threads NOT bolt threads, Most pipe or barb fittings are NPT, be careful though some blocks use BSSP ( British standard ) also there is NPTF ( National pipe thread FINE )
BSSP is close to NPT and with a bit of force NTP fittings will work ( I know I have NPT fittings in both my Innovatek blocks and they come threaded BSSP.
Hope this helps
Aardil
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