... fitting of galvanization can corrosion prevention and exchange used with porcelain insulator,this product is reliable structure,cannot damage the core rod ... is 2~2.5 times than the same creepage distance porcelain insulator,and not to cleanup,cansafe operate in the serious ... volume,light weight(only for the same voltage grade of porcelain insulator 1/6~1/9),lightness structure,to easy for ...