4" NPSH Male x 5" NPT Male Adapter Aluminum FM15F25F you'll need to shop here

you'll need to shop here at our fire hose section

3" inch camlock connectors are widely used with pumps

Strong inside rubber lining leads to less friction loss and more water flow

Camlock Size (Inside Diameter): 4" Female (Socket)

YOU CAN NOT USE A CRESCENT WRENCH TO OPERATE A HYDRANT:

4" NPSH Male x 5" NPT Male Adapter Aluminum FM15F25F you'll need to shop hereSpecifications Male Side 1 4 NPSH Male (National Pipe Straight Hose) Male Side 2 5 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 Through 8. 2 USDA