"The Bearing Buddy automatic pressure relief valve allows excess grease to escape if the hub is overfilled. When trailering, excess grease can be thrown onto the wheels. The Bearing Buddy Bra is a vinyl cover that fits over the Bearing Buddy to contain grease and keep it off the wheel. U.S.A. Application Contains grease, Material Vinyl, Includes qty. 2-pk, Diameter in. 1.88. Fits Item #12941 Size 1.88in."
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