Supporting tube GRP / Al for isolated air-termination systems, with M10 female thread, for air-termination tips or MV clamps for spanning cables and for fixing the HVI Conductor. For keeping the separation distance from conductive parts in accordance with IEC/EN 62305-3. Glass-fibre reinforced plastic (GRP) tube D 50 mm, UV-stabilised, light grey colour, material factor km = 0.7, one-piece.