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This part is no longer available from the manufacturer.Alternative part - Webasto UniControl Click here Webasto Unibox control for use with HD controller or Smart controller This Unibox must be fitted to the heaters listed below when adding a HD controller or Smart controller to your air heater Please note you also require wiring harness part number 9031714A Compatible heaters Webasto Air Top 2000 STWebasto Air Top Evo 3900Webasto Air Top Evo 5000Webasto Air heater HL90