WATER HEATERΚΑΥΣΤΗΡΕΣ WEBASTOΑΝΤΑΛΛΑΚΤΙΚΑIt is installed on the regular fuel line of the car. Can be connected to both supply and return.Compatible with Webasto : Air Top 2000 , Air Top 2000 S , Air Top 2000 ST , Air Top 2000 STC , Air Top 3500 , Air Top 3500 ST , Air Top 3900 EVO , Air Top 40 E..