Adapter, NPS Male to Hose Barb
Hose Barb to Male NPS Adapter.
The thread is compatible with an NPSH or NPSM female thread — usually a female hose end (similar to a garden hose). Whereas garden hose thread (GHT) only comes in size 3/4", these are the commonly used fittings for larger sizes.
NOTE: this thread is not compatible with NST/NH fittings.