... a high grade connection is guaranteed for many Solar Junction box ,Due to highly robustness,UV-resistance,the touch protection ... 5mΩDia of pin or socket 3mm /4mmProtection degree(mated,junction box closed/unmated) IP65/IP2XOperating temperature -40 C to +85C ... Insulation material PPOContact material Copper,silver platedThe junction box's inner shoulder be filled with glue under working