1.5" NH (NST) Female x 1" NPT Male Adapter Aluminum DMH2530T 3" inch diameter camlock fittings

3" inch diameter camlock fittings are most commonly used for fire hydrants

there is no stronger hose available

and ease of use

Fire hoses come in two styles: single and double "jacket" or "layer"

1.5" NH (NST) Female x 1" NPT Male Adapter Aluminum DMH2530T 3" inch diameter camlock fittingsSpecifications Female Side 1 1. 5 NH (NST) Female (National Hose National Standard Thread) Male Side 2 1 NPT Male (National Pipe Tapered) 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 236 8. 1