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Eberspacher Flame Overheat Sensor - New Generation For the new generation 2Kw Eberspacher Espar S2D2 Airtronic and 4Kw. M2 D4L Airtronic heaters. See models below. Suitable for the following Eberspacher Espar heater models; S2 D2L - 25272105 M2 D4L - 25272005 M2 D4R - 25274605 M2 B4L - 20198705 Suitable for both 12v and 24v Heaters NOTE: NOT suitable for generation 2 Eberspacher D2, D4 or D5 Airtronic heaters. See Airtronic D2/D4 Flame overheat sensor here. See Airtronic D5 Flame overheat combi sensor here.