... flanges assembly service We supply tubes for hollow insulators, surge arresters, HV swithes, current transformers and power transformers ... Tube 1.Inner Diameter:14-1000mm 2.Length: 10mm 3.High strength for application. 4.Test:SGS,National test5 ... .Application: Power Transformer,Current Transformer,Hollow Insulators, Bushing, Surge Arrester, High-voltage Current Limiting Fuse, On-load tap changer ...