Gustav Wahler GmbH u. CO. KG is a leading global supplier for exhaust gas and temperature management for internal combustion engines. It offers thermostat inserts; integrated, electrically heated, map-controlled sleeve, and electromotoric thermostats, oil temperature regulators; and thermoswitches. The company also provides electrical EGR valves, electrical EGR flap vales, electrical throttle flaps, pneumatic EGR valves, pneumatic bypass flaps, pneumatic actuators, oil return lines, water-cooled EGR, secondary air, and fuel filler pipes. The company was founded in 1902 and is headquartered in Esslingen, Germany. As of February 28, 2014, Gustav Wahler GmbH u. Co. KG operates as a subsidiary of BorgWarner Inc.