Webasto Thermo 90S 12volt combustion air blower. Seal part No 83515B should be replaced when replacing or refitting this blower.
This unit can be used on a Webasto Thermo 90 12volt heater. This blower is fitted with a slide bracket for mounting the control unit on a 90S, the 90 is not fitted with this bracket. It can CAN NOT be fitted to the 90ST heater.