4" NPT Female x 6" NPSH Male Adapter Aluminum SM250S Unauthorized uses have generally been

Unauthorized uses have generally been possible since

A pipe coupling can be stepped or reduced in internal diameter to accept pipes of different sizes

Pipe nipples are used to allow items with different threads to be connected together

and removing caps and other uses

5" (Choose NH/NST Fire Hose Threads or NPSH/IPT Straight Pipe Threads)

4" NPT Female x 6" NPSH Male Adapter Aluminum SM250S Unauthorized uses have generally beenSpecifications Female Side 1 4 NPT Female (National Pipe Tapered) Male Side 2 6 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 236 8. 1 Through 8. 2 USDA