fits e.g. VW T4 Chassis (70E,70L,70M,7DE,7DL,7D (please check exact vehicle application) HELLA preglow relays ensure reliable cold starts in diesel engines by preheating glow plugs to ignition temperature-even in low temperatures improving start-up performance and reducing engine stress. HELLA relays use low-voltage control to safely switch high-voltage circuits, minimizing wear and reducing wiring complexity. Always check the original part number to ensure correct fitment and full compatibility with your vehicle. Built to last-HELLA relays are resistant to dirt, moisture, and vibration, designed for thousands of reliable operations.