Garden hose threads (GHT) are screw thread standards set by ANSI-ASME B1.20.7 for couplings, fittings, nozzles, and valves for hoses. On the other hand, National pipe taper threads (NPT) are screw thread standards set by ANSI-ASME B1.20.1 for threaded pipes and fittings. More @Wikipedia
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