pin suspension porcelain insulator 52-1/52-2/52-3/52-4/52-5 Features 1)Cap and ... high voltag pin suspension porcelain insulator 52-1/52-2/52-3/52-4/52-5Features1)Cap and pin type ... Porcelain & Steel3)ANSI standard4)Item no.:52-1, 52-2, 52-3, 52-4, 52-5, 52-6, 52-8, ... on the abundant strength,advanced production technology,the technology of service,and reliable quality,stability and sincere service,and ...