6" Storz x 4.5" NPT Female Adapter Aluminum HA1510F but you could also use

but you could also use some standard drinking jugs when you're on the go

5” NH Female (National Hose / National Standard Thread)

Industrial & Fire Grade 3” NPSH x 4” NPSH Double Swivel Female Fitting Anodized Aluminum

and it has cam lock levers for locking the fitting's male groove adapter into female cam couplers

6" Storz x 4.5" NPT Female Adapter Aluminum HA1510F but you could also useSpecifications Storz Side 1 6 Storz Female Side 2 4. 5 NPT Female (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 Standards 5100 190C Tables 1