GRP/Al support tube with internal end cap and PA spring element for the HVI power conductor, for the separate (insulated) installation of air-termination systems with air-termination tip. To maintain the separation distance from electrically conductive parts in accordance with DIN EN 62305-3 (VDE 0185-305-3). Tube D50 mm made of glass-fiber reinforced plastic (GRP), UV-stabilized, color light gray, material factor km= 0.7. One-piece design, combined with air-termination tip (D10 mm, length 1000 mm) made of Al.