GRP/Al supporting tube with internal sealing end and EB spring element for the HVI light plus Conductor, for the separated (isolated) installation of air-termination systems with an air-termination tip. For keeping the separation distance to electrically conductive parts according to DIN EN 62305-3 (VDE 0185-305-3). Ø40mm pipe made of glass-fibre reinforced plastic (GRP), UV-stabilised, light-grey colour, material factor km = 0.7. One-piece version, combined with air-termination tip (Ø10 mm, length 1000 mm), made from stainless steel.