YH3 Oil Lubrication Stern Shaft Sealing Apparatus has the ability to resist fresh water and sea water corrosion. Its components can be replaced without removing the propeller and stern shaft, , greatly improving the maintainability of the equipment, largely shortening the maintenance cycle, and reducing maintenance costs, compared with the conventional integral sealing device.

It prevents seawater from entering the ship and oil from leaking out into the surrounding water. This helps in maintaining the integrity of the propulsion system and prevents environmental contamination. The sealing apparatus uses oil as a lubricant to minimize friction between the rotating shaft and the stern tube. This helps reduce wear on the shaft and bearings, ensuring smooth operation.