Meziere Water Pump Inlet Fitting, Straight, 1.000" Male NPT, 1-3/4" Hose Barb, Aluminum, Blue (Meziere 100 Series Water Pumps)

If you need to adapt large-diameter hoses, such as radiator hoses, to a component that has NPT-threaded bosses, Meziere's NPT to smooth hose adapters are right up your alley. They have a large smooth-hose nipple on one end and NPT threads on the other.