4.5" NH (NST) Female x 4" NPSH Male Adapter Aluminum DMH3030 It's more economical than it's

It's more economical than it's fire hose counterpart

2" NPT Male x 2" NPT Male

then you've found what you're looking for

The NST (NH) side of adapter can hook into NST (NH) threads only

4.5" NH (NST) Female x 4" NPSH Male Adapter Aluminum DMH3030 It's more economical than it'sSpecifications Female Side 1 4. 5 NH (NST) Female (National Hose National Standard Thread) Male Side 2 4 NPSH Male (National Pipe Straight Hose) Working Pressure 300PSI Max Test Pressure 1000PSI Max Material T 6061 Aluminum (Aircraft Grade) Finishing Anodized (99. 9% Lead Free) NFPA Standards 1963, 4. 12, 5. 1 5. 6. 4 (Corrosion Resistance) Military Standards MIL A 8625 Type III, Class 1 Industrial Standards International ASTM B221 UL Labs Standards