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Webasto Heater Combi Timer Upgrade kit 12v ONLY Timer type 1531 Suitable for all later generation Webasto air heaters Air Top 2000 STAir Top 2000 STCAir Top 3500Air Top 3900 STAir Top 5000Air Top 5500 ST Timer kit includes wiring harness and mount plate dash surround embellisher (as pictured)Operating & installation instructions