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Oil Seal

An O-shaped round seal (usually hardened rubber) used to surround part of a bearing assembly so grease doesn't leak out and water doesn't get in. Bearing seals are a wear item, and should always be replaced with bearings. If the bearing assembly for your vehicle is not sold with a seal or does not come with a built-in seal, bearing seals can usually be purchased individually. In some cases, these are also known as bearing retainers