This IMS watertight sliding door is a hydraulically driven type, with hydraulic powerpack, accumulator and control valves located inside the door frame. The door blade is actuated by two cylinders, one at the top and one at the bottom. Fixed with the cylinder ends at the door frame, and the rod ends at the door blade.
IMS Watertight doors are fitted with a mechanical lock, preventing the door from opening without needing to pressurize the cylinders.