GRP/Al support tube with internal end cap and PA spring element for the HVI long conductor, for separate (insulated) installation of air-termination systems with air-termination rod. 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 rod (D22 / 16 / 10 mm, length 2500 mm) made of Al.