High Quality Content by WIKIPEDIA articles! A stuffing box an assembly which is used to house a gland seal. It is used to prevent leakage of fluid, such as water or steam, between sliding or turning parts of machine elements. A stuffing box, or packing gland, is used around a propeller shaft at the point it exits a boat's hull underwater. It is the most common method for preventing water from entering the hull while still allowing the propeller shaft to turn. In a conventional stuffing box, the seal itself is provided by packing rings, or a square cross-sectioned rope, made of greased flax, which is packed or wound tightly around the propeller shaft, and compressed in place with a threaded nut and spacer. The box may also be fitted with an opening for periodic insertion of grease between the rings, and sometimes with a small grease reservoir.

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