JQ/CS 49 Stern Shaft Sealing Apparatus can used for vessels in inland water whose lubricating working medium is oil. JQ/CS 49 Stern Shaft Sealing Apparatus has the back sealing device and front sealing device.

The front stern shaft seal is mainly used to isolate the stern shaft tube and the cabin, because it is located in the cabin, once damaged, the stern shaft tube oil will leak into the cabin, easy to find and maintain, so its structure is relatively simple.

The sealing of the stern shaft is mainly to ensure the isolation of the stern shaft tube and the sea water overboard to prevent the internal leakage of the sea water overboard and the external leakage of the oil in the stern shaft tube.