3" NPT Female x 3.5" NPSH Male Adapter Aluminum FM25F10T Available Threaded Sizes (Inside Diameter):

Available Threaded Sizes (Inside Diameter): 2-1/2" Female NPT (National Pipe Tapered)

Slide your hose straight into the barb end

Alternatively

inside layer is rubber liner

Fire & Industrial 6” NH (NST) x 6” NPT Double Male Fitting Anodized Aluminum

3" NPT Female x 3.5" NPSH Male Adapter Aluminum FM25F10T Available Threaded Sizes (Inside Diameter):Specifications Female Side 1 3 NPT Female (National Pipe Tapered) Male Side 2 3. 5 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