The underwater demountable thruster can be removed and exchanged without taking the vessel out of service. T here are three main components of the underwater installation system. The receptacle with the outer cap (top), the inner cap (middle), and the thruster (bottom). The inner and outer caps are installed at the factory and shipped to the site. Once installed into the vessel the outer cap is removed to access the inner cap. The inner cap is then removed to reveal the hydraulic steering motors and attachment for the cardan drive shaft.Underwater Mount Thrusters for Dynamic Positioning are installed after the vessel is launched. Because of the need to insure an accurate fit and seal integrity Thrustmaster also designs and manufactures the receptacles. The receptacles are mounted into the hull by the shipyard before launching.