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This temp sensor is mounted on the heat exchanger closeset to the glow plug. This temp sensor has a blue wire harness. It fits all B5L/D5L/B5LC and D5LC heaters, but DOES NOT fit the Airtronic series heaters

This temperature sensor fits all D9W and Hydronic 10 heaters, 12 or 24 volt models

Temperature Sensor for the EasyStart Pro, for use with the following heaters: Airtronic, Airtronic M and Hydronic HS3 CS.

Temperature Sensor for the EasyStart Timer, for use with the following heaters: Airtronic L, Hydronic 16 / 24 / 30 / 35 and the Hydronic M-ll.

This adapter is required to allow connection of the diagnostic tester to the Airtronic D2/D4 heaters.

The thermal insulator is used between the burner and the heat exchanger; this insulator should be replaced anytime the heater is diassembled