This fuel metering pump heater is designed to work with Eberspacher Airtronic D2 and D4 auxiliary heaters. It accurately controls the flow of diesel fuel to the burner unit, ensuring reliable operation even in cold conditions. With a sturdy construction and precision German engineering, this heater provides consistent warmth automatically so the inside of the vehicle reaches a comfortable temperature quickly. Easy to install with original equipment fittings and connectors, it directly replaces the old unit for simple plug-and-play functionality. Backed by the quality and innovation of Eberspacher, this pump heater keeps auxiliary heating systems operating at peak efficiency season after season.