This Eberspacher base gasket seal is designed for a perfect fit with various Eberspacher Airtronic heater models, including the D2, D4, S2 D2L, M3 D4L, and M3 D4R. It is made from durable black rubber. Consider using spacer base gaskets for unobstructed heater installation on corrugated floors. This is a genuine Eberspacher part, supplied by a UK dealer and distributor.