https://en.wikipedia.org/wiki/Stuffing_box A stuffing box or gland package is an assembly which is used to house a gland seal.[1] It is used to prevent leakage of fluid, such as water or steam, between sliding or turning parts of machine elements.

Components
A stuffing box of a sailing boat will have a stern tube that is slightly bigger than the prop shaft. It will also have packing nut threads or a gland nut. The packing is inside the gland nut and creates the seal. The shaft is wrapped by the packing and put in the gland nut. Through tightening it onto the stern tube, the packing is compressed, creating a seal against the shaft.[2] Creating a proper plunger alignment is critical for correct flow and a long wear life. Stuffing box components are of stainless steel, brass or other application-specific materials. Compression packing is rigorously tested to ensure effective sealing in valves, pumps, agitators, and other rotary equipment.

No século passado, as vedações em automóveis e barcos começaram como vedações de corda de poço de grafite e mais melhorias foram adicionadas.
https://pt.aliexpress.com/item/1005005484340664.html quote, Grafite misturado glândula embalagem anel 50*70*10mm hardware vedação acessórios anel de vedação mecânica. (probably TAO, and may not be the best) "embalgem"?

A packing for a well, the graphite rope was forced into the groove of the iron groove and became a seal. I have done this, rear seal on 1950 Chevy six cylinder engine.