... strength of thread Fiberglass winding tube for power Transformers/fiberglass round tube/pipe Our tubes are divided ... hollow insulators, surge arresters, HV swithes, current transformers and power transformers Features: Fiberglass Winding Tube 1.Inner Diameter: ... Labs3.Application: Power Transformer,Current Transformer,Hollow Insulators, Bushing, Surge Arrester, High-voltage Current Limiting Fuse, On- ...