4.5" NPSH Female Swivel x 2.5" NPT Male Adapter Aluminum DMH2020T You already have your own

You already have your own 3" Inch couplings and you can connect them yourself

This tunnel can absolutely hold flexible solar panels

Surface pumps (not included

Storz Side 2 – 5” Storz Rigid

Industrial & Fire 4” NPSH Female x 4" NPT Male Fitting Anodized Aluminum

4.5" NPSH Female Swivel x 2.5" NPT Male Adapter Aluminum DMH2020T You already have your ownSpecifications Female Side 1 4. 5 NPSH Female (National Pipe Straight Hose) Male Side 2 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.