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Coolant Thermostat 4174.82D by Wahler Wahler has focused on the temperature and exhaust gas management for Internal Combustion engines. The ongoing improvement in the performance of automotive power plants goes hand in hand with innovative developments by Wahler in the areas of Thermostats and Exhaust Gas Recirculation systems (EGR). Temperature control technologies, pneumatic / electric actuators and flexible metal pipes from Wahler make a significant contribution towards more efficient, more reliable and more powerful engines.