A seal 28 comprising a primary seal 60 and at least one outwardly-directed protrusion 166. The protrusion (166, Fig. 7), which may be an annular rib, has axially inner (168, Fig. 7) and outer (170, Fig. 7) surfaces, the inner surface (166, Fig. 7) extending inwardly at an angle of at least 0° relative to a lateral plane. The primary seal 60 may be a labyrinth seal. Also disclosed is a gearbox 12 containing two parallel shafts 14, 16 drivingly-interconnected by gears 22 mounted on the portions of the shafts within the gearbox 12; and a seal 28. Further disclosed is a method of modifying a piece of equipment with a labyrinth seal including a labyrinth ring. The method involves removing the labyrinth ring and replacing it with a labyrinth ring 32 of the seal of the first aspect.
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