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Webasto Diagnostic Test Adaptor Cable Part number 116.274 The Diagnostic Adaptor cable is used in conjunction with Diagnostic test unit 440280 to test Webasto DBW Sensoric Water Heaters (Fitted with Black plastic control unit) Suitable for the following Webasto HeatersWebasto heater DBW2010Webasto heater DBW2020Webasto heater DBW300Webasto heater DBW350Webasto heater DBW470 Please note;Only for use with Sensoric versions(Fitted with Black plastic control unit)