... High strength of thread Fiberglass winding tube for power Transformers/fiberglass round tube/pipe Our tubes are divided into ... arresters, HV swithes, current transformers and power transformers Features: Fiberglass Winding Tube 1.Inner Diameter:14-1000mm 2.Length ... .Test: SGS, other tests in National Labs3.Application: Power Transformer,Current Transformer,Hollow Insulators, Bushing, Surge Arrester, ...