1,High current carring capacity 2.Insulation material: PPO 3.Compliance with MC4 ... 3mm/Φ4mmExternal size: The advantages of my solar junction box:This SC-JB2 Junction box confirms to TUV approvalSimple, safe, fast, ... anti-aging, water-proof and UV-resistance propertiesOur junction box is with the lowest contact resistance:0.4m ... suit both financial and specification constraints. solar PV junction box2