... Φ3mm/Φ4mmExternal size: The advantages of my solar junction box:This SC-JB2 Junction box confirms to TUV approvalSimple, safe, fast ... reliable, connective solutionsThe flexible and multifunctional structure: with one box, circuits can achieve the interchanges between series and parallel ... -aging, water-proof and UV-resistance propertiesOur junction box is with the lowest contact resistance:0.4mΩ,which ...