Designed for installation of the regulator 82819B, 1322581A on the instrument panel.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 EVO , Air Top 5000 , Air Top 5000 ST , Air Top 55 EVO ..