... Voltage Pin Type Insulator 55-4 1,Material: Porcelain 2,Port:Fuzhou 3,Payment Term:T/T,L/C 4,Standard:ANSI ... Low & Medium Voltage Pin Type Insulator 55-4 High ... voltage porcelain insulator 1)Series:55-1,55-2,55-3,54-4,55-5 ... ,etc.2)Material:Porcelain 3)Standard:ANSIMAIN DIMENSIONS AND STANDARD ...