These are sealing devices used on ships to close manholes. They are classified into protruding and recessed types according to the installation method. The materials are mostly hot-rolled carbon steel or the same steel as the ship's hull.

Installed on hatches for personnel access, they can be opened and closed both inside and outside. The main function of this device is to close the ship's hatches, with waterproof, windproof, and wave-proof capabilities.

Marine weathertight single-leaf steel door, quick-opening&closing weathertight steel door (hand wheel-type), steel double-leaf quick-opening and closing weathertight door, and manually hinged pressure watertight door.

These are circular watertight windows installed on the ship's side outer plates, superstructures, and the outer bulkheads of deck houses. They consist of a main window frame, a glass pressing plate, and a weathertight cover.

They are important devices for fixing the position of a ship during berthing. Their core function is to resist external forces such as water currents and wind through the grip on the seabed, ensuring the stability of the ship at berths.

As a kind of buoyancy device widely used in water engineering, channel marking, marine aquaculture, and environmental protection governance, their core function is to provide stable buoyancy support.

These are special devices used when a ship is moored to a wharf, buoy, or other ships. They consist of mooring ropes, fairlead devices, bollards, winches, and cable reels.