Marsh Automation Pvt. Ltd. Offers Electric Thrusters with Weather Proof Construction. Marsh Automation Pvt. Ltd. Is an ISO 9000 awarded company. The company manufactures Electrical Activators Motorized Valves, Pneumatic Valves, Electrical or Pneumatic Actuators. The Electric Thrusters with Weather Proof Construction is suitable for operating large size dampers, flaps, shutters fan blades etc. From a remote control station in ON/OFF and Regulating modes. The Thruster units swivel either in one two axes while imparting the Thrust, so as to achieve correct alignment with the final control element.